> <http://www.example.org/subsite1/subsubsite1/subsubsu>
> bsite1/
Always post the command line used (log file line two) with the actual url.
There are many different reasons - site dependent.

> <http://www.example.org/subsite1/subsubsite3/subsubsu>
> bsite3/
> <http://www.example.org/hash1/file.pdf>
Since the pdfs are not down from the page, and the default is to go down, you
get nothing. Either set travel mode up&down or specifically allow +*.pdf

> I can access those files only after login with
> username and password.
You must have HTT log in. <http://httrack.kauler.com/help/Authentication> and
don't forget to filter out the log-out url.

> I wrote a textfile with all the sites containing
> pdf-files 
and did you use action=get seperated files with a url pointing to the file -
Always post command line used.