What is behind the "Indian Undergrad Research Experience"-spam? Every now and then I receive an email claiming to be from some undergrad student in Math or Computer Science at an Indian university asking for a summer research experience in "my research group" (there is no such thing).

These emails all have a very formulaic structure. There always is a claim that the student read and very much enjoyed some paper of mine, but never any indication that this actually happened (ie no reference to stuff in the paper). In particular, these emails look like they could have been sent to dozens of people with a little bit of copy&amp;paste. Attached are real-looking CV's.

Are these real students or this is some elaborate scam? If these are from real students, why do they think this could potentially work? Why India?

Edit: While I have only received emails like this from India, in the comments Tom Curch mentions having received some from China, too.
I graduated from a premier Indian university more than a decade ago and have sent out such emails. Let me try to put this practice in context.

Like many universities around the world, Indian universities have a semester system and a three to four month summer break in-between. Many Indian universities (but not the IITs) have a compulsory summer internship that must be completed in the summer before the final year. These internships can be done either in industry or academia. Therefore, it is common for Indian students to apply for internships. Until the late 1990s, most students used to apply for such internships within India.

The situation changed in the late 1990s because a couple of European universities (EPFL for sure, but I think that there were others as well) started a summer internship program for Indian students (almost exclusively from the IITs). The primary reason was to attract Indian students for graduate studies; at that time most Indian students went to English speaking countries. I participated in such a program in the early 2000s.

These programs did not result in any mass emails. The department of the Indian university used to send a list of student CVs, and the department at the European school would select from that list. 

However, once students realized that European universities accept students for internships, they started applying en mass. And most, if not all, of them got offers, typically from universities in Switzerland, Germany, Austria, Spain, and Singapore; but also occasionally from the US and UK. (At least, this was the situation at my time). Initially, only IIT students were doing this; slowly everyone else also started applying.

At our time, some of us applied because we wanted to experience the research environment in Europe, others applied because they wanted a paid vacation. Some were meticulous in their search and wrote personalized letters; others simply sent out a form letter to everyone. My understanding is that most students (at least from IITs) still get such internships, so the practice continues.

Note that the universities which started this practice to attract Indian students were successful. They saw an increase in the number of students from IITs who applied for graduate studies. I have friends who went to study in a non-anglophone European country because someone had gone to the same university for an internship and had had a positive experience.

I don't know if more European universities have started this practice or not; but I know that recently Canadian universities (rather a Canadian funding agency) started a university internship program for international students from India, China, and Brazil.