Where do 302 redirect domains come from?

Question

PHP

I bought a domain, tied it to a hosting and found that redirects were happening.
HTTP status code 302 Found
Server response time 16 ms
Site IP 91.217.9.185
Page size 0 B
Connection: close
Pragma: no-cache
cache-control: no-cache
Location: hackmycredit.ru/LcgPk
https://webmaster.yandex.ru /tools/server-response/...
The location parameter is constantly changing
/LcgPk/
/eKYXe/
/WUVVX/
At first I thought about hosting, I installed the same on another. Then to dns, I changed dns reg ru to dns hosting. Problem still exists. I also exclude it in the code, because now just html is given by domain.
For my other domain, the same problem.
https://webmaster.yandex.ru/tools/server-response/...
HTTP/1.1 302 Found
Connection: close
Pragma: no-cache
cache-control: no-cache
Location: /akfVW/
HTTP/1.1 302 Found
Connection : close
Pragma: no-cache
cache-control: no-cache
Location: /
HTTP/1.1 200 OK
Server: nginx
Date: Thu, 09 Mar 2017 07:20:03 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Set-Cookie: PHPSESSID=d73974be25a7529bbe5eefe5b08bb59b; path=/; HttpOnly
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Set-Cookie: _csrf = c0e1aefd8b438dbb3ba8ff80da8d4c6e078a9588bce8597b63e06f1362968791a% 3A2% 3A% 7Bi% 3A0% 3Bs% 3A5% 3A% 22_csrf% 22% 3Bi% 3A1% 3Bs% 3A32% 3A% 22z61s09bb0LIjUsvhYpBM30SW0mHVo2ur% 22% 3B% 7D; path=/; HttpOnly