걍 스크립트 돌리면 됨.
import requests
import hashlib
url="http://docker.hackthebox.eu:31511/"
req=requests.session()
get=req.get(url)
target_string=get.text.split("<h3 align='center'>")[1].split("</h3>")[0]
print (target_string)
hash_string=hashlib.md5(target_string.encode('utf-8')).hexdigest()
data={
"hash": hash_string
}
post=req.post(url,data=data)
print (post.text)