This stands for "Web Download," meaning the file was ripped directly from a streaming service like ZEE5 without re-encoding, which usually preserves high quality for that resolution.
The resolution is Standard Definition (SD), which is lower quality than HD (720p or 1080p) but results in a smaller file size.
The film is an original release on ZEE5 . File Name Breakdown
These files and the sites hosting them are frequent vectors for harmful software.