Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79577e0485b82e9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-06 05:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d89347d03f2bb1ead348963b13a69fc SHA-1: 1e91a6fdce9b5d0f0f8f2c25a19cb5b9a9c41d27 SHA-256: e79577e0485b82e9ef0af17a23cca534ecb02b02bbeb17439d8f79e6c2c08373
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to external resources. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7758

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b121db106---pugipelimuwigisisu.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7237b488d0---zederomid.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/61059274025.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37f62d2cd8---54199516383.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/gopadipuwuxeg.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6d6e02c1---60411183975.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/ropatanewetovumabekene.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae8a5dc80---wusipabu.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/o2mog0621bk11fg56hmpa0p68u/57070233432.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tfmqonsl87ounqmkt51b57dq6h/38911881919.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0519884148d4222156dafca77cb44764/73359235686.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/relufavametibesi.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/gosinotir.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/45036306423.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/42001008773.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/72916724080.pdfIn PDF document text
    • http://boxethai38.com/upload/file/gujefuweperasewija.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ok1ch43r2fulmuetve3bgm08q7/tinomowe.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160779fbd7c55c---tabupuzapugajuwexebuguw.pdfIn PDF document text
    • http://indecomavo.pl/inc/40306788965.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/biwefegun.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e87817149---tomis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=schoolhouse+rock+grammar+rock+worksheet+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 10940 bytes
SHA-256: af19e413ba5a5eb5e760299db8f8ae5bec48040d340744d251230978def374ee

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