Your question is kind of confusing because if you want www.example.com/pathname to display the content of info.example.com/page.html, there's no reason to point info.example.com anywhere other than Marketo. In fact, if you changed it, it would never work, since www needs to read from Mkto!
It sounds like what you want is a simple proxy ("symlink" has no relevance here). A capable sysadmin could set this up instantly.
Depends on what webserver you're using. For IIS, ARR. For Apache, mod_proxy. If you're already using a CDN or other reverse proxy (Squid/Varnish) that's where you'd configure it. In all cases it's easy stuff, though if you don't manage your server you'll have to find the right person. This does jump the wall between IT and SaaS so everyone needs to be on the same page.
Adchoices