Hint:

1. Company Domain: PentesterAcademy.com
2. Usernames: nick, admin
3. HTTP Authentication Password Complexity: 5 characters and uses only x,y,z lowercase. Password examples - xxxyx, xyzxy,zzzzx etc.
4. Think out of the Box. Tools may fail.
5. Try scripting your own tool using Python or other languages
6. Think about all you've learnt at Pentester Academy :)