By default directAdmin put these files in an user-account:
/public_html/cgi-bin
/public_html/index.html
/public_html/logo.jpg
/public_html/400.shtml
/public_html/401.shtml
/public_html/403.shtml
/public_html/404.shtml
/public_html/500.shtml
You can change them here
/home/admin/domains/default/