Calling open from terminal with smb file path and preview as application opens finder instead of preview

I am trying to open a file on an smb share in preview from terminal. The following command opens the containing folder in finder instead of the file in preview.

open -a /Applications/Preview.app "smb://myshare._smb._tcp.local/path/to/file/my_file.pdf"

Update 1: I tried with and without the -a switch. The same thing happens in both cases: finder is opened with the last folder (/path/to/file). Preview is already associated with PDFs, so it should open automatically.