Why does bing.com crawl into phpMyAdmin?

Question

Nginx

Found something like this in the logs:

2017/09/28 03:54:29 [error] 9731#9731: *11851 "/var/www/phpMyAdmin/index.php" is not found (2: No such file or directory), client: 163.172.168.251, server: 111.222.222.111, request: "GET http://www.bing.com HTTP/1.1", host: "www.bing.com"

the entire log is littered with it, every day with an interval of 30 minutes.
What does he need and how to block him at the NGINX level?

Answer 1

The usual vulnerability scanner.
bing is not real

Answer 2

Found the technique of this infection, for review https://lolzteam.net/threads/210498/