Malicious PDF — malware analysis report

Static analysis result for SHA-256 9607fd6c10ee39f7…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 09:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 775b57d47f387edfdc962df8c5852ec1 SHA-1: 21820fb265839b4d39bde7e9b0685efcc10dd967 SHA-256: 9607fd6c10ee39f749de9f8afac891c393d58721ca2c7e8705a366d58b9fc9bd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://synerhu.ru/uplcv?utm_term=sniper+3d+cheat+apk
    • http://alvit-bk.ru/userfiles/file/39740648418.pdf
    • http://er-trans.com/img/produkty/files/kiwusojumewuzuwunej.pdf
    • http://pp-aqua.com/userfiles/files/48072867383.pdf
    • http://aolisenjiancai.com/data/files/83656010455.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd8f528e8e---sodemejisis.pdf
    • https://ibshospitals.com/userfiles/file/datusitemon.pdf
    • http://nuuts.mn/uploads/assets/12818275988.pdf
    • https://bvphcn.bdata.vn/upload/files/78312689976.pdf
    • https://deesudcoolingtower.com/userfiles/file/92606321791.pdf
    • http://utcsp.rustyramone.com/uploads/files/40298832819.pdf
    • https://maria-galland.ru/files/file/62852892563.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/nanemimarogumipevok.pdf
    • http://daiichilogistics.com/uploads/news_file/lametuxazulo.pdf
    • http://tbeaindia.com/userfiles/file/24968936207.pdf
    • http://flexinform.com/hirlevel/file/vajaluzexanuvepunapur.pdf
    • https://www.igescanada.com/ckfinder/userfiles/files/36126491477.pdf
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/10363804943.pdf
    • http://emailreceptionist.net/userfiles/file/sesajimezeko.pdf
    • http://nifaelectronics.com/userfiles/file/13748670190.pdf
    • http://elpijisystem.com/file/55087855952.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615207217aaae---779693620.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2be8c1e3---43082311134.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ace9.bin
7a68cb9c68520086dd44709e72edde36c4811c6fdae902882b11773dee391514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACE9 16344 bytes
font_01_sfnt_off0000d6ae.bin
a19a1b0c304b6ba5074fe403f4cc5d496ef877dcb8ec3bd279edacf58d7c53b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 10616 bytes
font_02_sfnt_off0000eeed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 16792 bytes

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