Your server has been hacked.

Remove from file:

/etc/apache24/httpd.conf

Strings:

Alias /d/ch/potenztabletten-viagra /usr/local/www/apache24/noexec/userdocs/base/index.php

Alias /d/ch/cialis-potenzmittel /usr/local/www/apache24/noexec/userdocs/base/index.php

Alias /d/at/potenztabletten-cialis /usr/local/www/apache24/noexec/userdocs/base/index.php

Alias /d/de/viagra-rezeptfrei /usr/local/www/apache24/noexec/userdocs/base/index.php

Alias /d/de/cialis-kaufen-rezeptfrei /usr/local/www/apache24/noexec/userdocs/base/index.php

Change administrator passwords, ssh, ftp, regenerate keys, check the site for backdoors loaded from the administrator.