Malicious PDF — malware analysis report

Static analysis result for SHA-256 d874c4610ccde1f2…

MALICIOUS

PDF

76.3 KB Created: 2021-09-08 07:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61d04fd85b45e74977369fdcf8e64785 SHA-1: 1f7925f0ded792690ce8a03d8756562fa4e3c37e SHA-256: d874c4610ccde1f2a8e989f06d2d60b0e56e3a922a559f79f880cd692d00d4f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing or trojan threat. The presence of external URI links and link farm heuristics strongly suggests the primary purpose is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=asvab+afqt+for+dummies+pdf PDF link annotation
    • https://susta.vn/userfiles/file/76500171640.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/dutuwuzoxesil.pdfIn PDF document text
    • http://candientushinko.com/images/file/13340233463.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/juguwepokek.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/jjepb3ip50gruhn3jdh6me1ce7/ramula.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/lifiwujuvabij.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/fawewekegivegopoguvav.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/zibipagejekin.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/nuxem.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/63625828600.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161233d93a2f18---52148825288.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/duzegudapifexikokotufo.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/16735905684.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0afb500bbfe71b529850c11ae3872eb3/47636310479.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/sejoxunomoraxinetevop.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a1b53fe69---kafizinesaki.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/a82h8be40dlndd2d9cqh4givc1/83713615825.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/resanusebukatopixan.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/sijetuvevab.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/limizejibo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137e78371e26---nakuf.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/bonomixiwuzubagukawinus.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161100170178e7---97180149880.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 10944 bytes
SHA-256: 5780403235adebfd4ca46c5c0befe1cfb841df7a80b75aaed1f3c47827be10fd
font_02_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 16700 bytes
SHA-256: f8e04540510d957e14cd67f41a579f1316445ff89de6bca4e800e9e528c25de8

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