Is the usage "can able to" wrong? I believe it's wrong. But where can I find some reference on the same?
This is Indian English. If you are talking to the rest of the world you should check out
Mind your English. Otherwise it's fine.
This may be common in Indian English. However, it's certainly not accepted as Standard English because, as you say, can and be able to have the same meaning.
Because able to isn't a verb but part of an adjectival phrase, it requires a verb; but as it's adjectival that verb is be, not can.