How you’d be liable is this: once you saw the info, you clearly knew it was private info. You didn’t stop. As a matter of fact, you rifled through many many pages. And then recorded/copied the info for use elsewhere.
If I were an attorney hired by one of the cheaters who gets his/her college acceptance reversed and could trace it back to you, I’d advise them to sue you and would likely win due to your malicious conduct. All I’m saying is you better cover your tracks. I’m not an attorney and have no idea of your country’s legal system – but you better be careful.
Heck, just print everything out and send it to the colleges via postal mail. If the facts are so bold face verifiable, it should be clear to anyone what the fraud was.