http://evac6dnxygj6dsvujt5hcz7rxka34bhyegbbaawrsvw6dotfvkhdvhid.onion
OnionShare (docs) (whonix Wiki) lets you securely and anonymously share a file of any size.
It works by starting a web server accessible as a Tor onion service,
with an unguessable URL that you can share with the recipients to
download or send files.