Have you ever looked in the apache config files to see where a website's virtual host is defined? The apache2ctl script has a useful option that could come in good here. When you execute the command, it should look like this:
apache2ctl -S
You'll obtain a list of all virtual hosts and default servers in the shell, along with the line number where they're declared. Example:
~# apache2ctl -S VirtualHost configuration: wildcard NameVirtualHosts and _default_ servers: *:8080 is a NameVirtualHost default server ispconfig.local (/etc/apache2/sites-enabled/000-ispconfig.vhost:10) port 8080 namevhost ispconfig.local (/etc/apache2/sites-enabled/000-ispconfig.vhost:10) *:8081 is a NameVirtualHost default server ispconfig.local (/etc/apache2/sites-enabled/000-apps.vhost:10) port 8081 namevhost ispconfig.local (/etc/apache2/sites-enabled/000-apps.vhost:10) *:80 is a NameVirtualHost default server ispconfig.local (/etc/apache2/sites-enabled/000-default:1) port 80 namevhost ispconfig.local (/etc/apache2/sites-enabled/000-default:1) port 80 namevhost example.com (/etc/apache2/sites-enabled/example.com.vhost:7) Syntax OK
Thanks to Planetfox for this tip.