This was a crazy story I saw last year in Mashable: https://mashable.com/2017/09/05/fake-photojournalist-eduardo-martins-brazil-instagram/#Mjp3hTZcBZqf
A man falsely claimed to be a war photojournalist, and he took other people's pictures and submitted them to a variety of publications. Even the Wall Street Journal was duped. The guy went by the name "Eduardo Martins," and he made social media profiles and even a personal website.
I like to imagine that I wouldn't be duped by this type of charade, but who knows...