Doxing is just acquiring someones public information such as pictures, address, etc. A simple Google search can also be used to dox but to be honest what can you do with that information anyways? Maybe just the pictures if you want to meme on someones attractiveness but that's tragic anyways. If you call pizza or some other shit like their phone number then good prank buddy, you're a master memer.
It would be hard to find out who it was unless you have a general idea of who it could be. IMO doxing doesnt become a problem until they start spreading the info to others or make something out of it themselves. Should it be perma? Depends on what they did with the information. After all it's also the targets responsibility on how they treat their own personal Information on the internet. I don't know how mine is but it should be just my name but whatever, I'm not too concerned for that at the moment.