Explain about this method of hacking the site?

Question

Domain Name System

Explain about this - Explain this scheme of hacking the site?
The answer to the question is there, but how is it possible?
Posted, uploaded.... where did the hacker get the source of the site from and how could he bind someone else's domain?
What is such a scheme called?

Answer 1

The domain was tied by the owner of the domain itself The
IP to which the domain is bound does not belong to one droplet
No one received the site sources - they placed a garbage dump on static or php
This scheme is not a hack, but the use of sloppiness

Answer 2

How? Vadim Galtsev answered there.
Nowhere, I used my server
"Don't care to leave the server IP in "A" records on an abandoned domain"