Automatically log in after authentication

I have a system web app, instead of having to grant an account to a user, I want to use F5 APM to authenticate by the AD account, after successful authentication, the system will automatically check and log into the web app, the user does not need to enter, the account will not be provided to any user.

 

How it works like:

 

If the user AD is user1 and user2, automatically enter the webapp1 account, similarly if it is user3 and user4, automatically enter the webapp2 account, ... (It is the same as the way PAM system works)

 

Is there any way to perform the process as above? Please suggest to help me in any way?

 

Thanks very much!