Malicious PDF — malware analysis report

Static analysis result for SHA-256 af25004c1fff0488…

MALICIOUS

PDF

92.4 KB Created: 2022-04-15 23:34:39 Authoring application: Irs Installment Plan Interest Rate And Penalties suites (via FPDF 1.82) First seen: 2026-06-22
MD5: 1b4711c6ee89f83c62b12a98dec5aeb4 SHA-1: 20d06f533da5c01c59747d164919ecd8d92458f9 SHA-256: af25004c1fff0488c0eb28f7a6557191fd7c605f25917d4f1bacb66a32061a7c
92 Risk Score

Machine Learning

  • Nyx PDF Classifier clean score 0.0031

Heuristics 3

  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • PDF carries SEO doc-farm redirector links (/pdf/<domain>) medium PDF_SEO_DOC_REDIRECTOR_LINK_FARM
    PDF contains clickable redirector links whose path ends in a bare website domain behind a /pdf/ or /doc/ segment (e.g. 'host/Document-Title-Slug/pdf/target-site.tld'), paired across both variants and/or alongside links into WordPress form-plugin upload storage. This is the generated 'free document/template' SEO phishing family: scrambled filler text plus links that route searchers through a redirector into payload/redirect chains. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://msfnbldc.site/Irs-Installment-Plan-Interest-Rate-And-Penalties/pdf/www.direct-start.com In PDF document text
    • http://msfnbldc.site/Irs-Installment-Plan-Interest-Rate-And-Penalties/doc/www.direct-start.comIn PDF document text
    • https://www.direct-start.com/wp-content/uploads/formidable/8/example-of-mla-quote-citation.pdfIn PDF document text
    • http://msfnbldc.site/irs-installment-plan-interest-rate-and-penalties/doc/www.direct-start.comIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001671a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1671A 76950 bytes
SHA-256: 43b13684882d332187dbe2691d5e4f64c33a98e381a4dc2316374ba1b923b47c

Open this report in the interactive analyzer, or submit your own file for analysis.