Yes, some websites combine all volumes into one PDF (usually 300–400 MB). Archive.org has a "Complete Set" scanned by the Islamic University of Islamabad. Search: "Qasas un Nabiyeen complete urdu 5 in 1" .
If you want to find a clean PDF in seconds, copy and paste the following queries into Google:
The book uses a progressive method, starting with simple sentences and gradually introducing complex grammar and vocabulary. Quranic Vocabulary: Readers are introduced to over 2,500 Arabic words
Use quotes for exact match. Look for scanned copies from the 1960s-1980s which are typically copyright-free.