Malicious PDF — malware analysis report

Static analysis result for SHA-256 709fe25329a038f3…

MALICIOUS

PDF

93.2 KB Created: 2021-06-26 20:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7425e2434854561acd5b93ad4b2b60b9 SHA-1: ee7d54963bd4a7b40c3d5cb443ba6bc9840c304b SHA-256: 709fe25329a038f300a41452fbb1e4cc60f4bfb3f4cad10a68c61772dbffbef2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=cerebral+blood+flow+physiology
    • https://anukulagrotech.com/userfiles/file/44956083532.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fb5b91743---69648570452.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5876a4308f60f4b37bf035574f1c8d44/74189172912.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5fe30313e14012e341c9f69c860238fe/67622937251.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/79235344841.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160762224197bb---liwifepajo.pdf
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/mojovinutewizuf.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/pebipanikogiva.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ffceb49182128a80446328b5a634a841/renifemubebelexurubamoxon.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bffd92ff5---rokodolonuninedotogirono.pdf
    • https://x-software.cz/data/file/80507473445.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608487dac543e---84774830503.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/530eb3f607e4bdf3c61db55dbcd2a108/zodabesofokonej.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092a3f9c473c---28853272888.pdf
    • https://berbagiangka.com/contents//files/47893352788.pdf
    • https://gencerenerji.com/resimler/files/pizekipavujasifezom.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4bd101445---3859516834.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c152b36e825---sotegileduvupulo.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/191b5ea107f127a8d0e4f0264f475a5c/winubesufex.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb4f00f8c---xaxawipaxufolitamovironab.pdf
    • http://superfishinglewood.com/uploads/files/xevuwuwuwilapajabuxekadop.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1a34ae97b---potejofogijemus.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903e55e9166---figebinapojopopun.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_off000107bd.bin
2c560a90be841660e1bcd54493fc09cdaab46b9349d78e5c5d59b38fc65d4c03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 10948 bytes
font_01_sfnt_off000120e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 16792 bytes
font_02_sfnt_off000138f4.bin
15c0b9be470e04a87f87ecfea14180abca447dafab7cfe5a24b24757e034d71e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138F4 17160 bytes

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