after

<VirtualHost www.unibrasil.net:80>
    ServerAdmin webmaster@unibrasil.net
    DocumentRoot /var/www/html
    ServerName www.unibrasil.net
   ScriptAlias /cgi-bin/ "/var/www/cgi-bin/"
<Directory "/var/www/cgi-bin">
    AllowOverride None
    Options None
    Order allow,deny
    Allow from all
</Directory>
</VirtualHost>

<VirtualHost usuario.unibrasil.net:80>
     ServerAdmin webmaster@unibrasil.net
     DocumentRoot /var/www/html
     ServerName usuario.unibrasil.net
     ErrorLog logs/error.log
#    CustomLog logs/access-log.log
     RewriteEngine on
     RewriteRule ^/(.*)$ http://usuario.unibrasil.net/info.php?id=$1
</VirtualHost>