all — Private companies asking for Aadhar & PAN number in their career sites and/or in employment form

Nowadays I've seen that many private companies ask for PAN & Aadhar numbers in their career website and/or form in employment forms.
It is fine if I'm selected by the company and I've to submit the documents for proof but just to apply for job it seems suspicious.
Why is it mandatory to provide my PAN & Aadhar numbers when applying for a job?
This is serious issue as this data can be misused by them.

Below mentioned are some private company names & websites:
Linde Engineering India; http://www.leionline.in/
MKC Infrastructure Ltd.; https://mkcinfrastructureltd.com/