Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f38e2718394c41…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 10:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c54caa44ca3d69eb3efcb7a526ee5a9 SHA-1: b261cb22aa96a8a6134ab022a1c7d7c69e24fbeb SHA-256: d9f38e2718394c415427d90c3f2803b06a01a3881a1105232207f39f2cff67da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the link farm and the ML classifier's output indicate a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/71c0bdba12e9414fd34d2dd092b202c7/dufopetezububed.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c63e020cfd---51213558804.pdfIn PDF document text
    • https://dcimx.com/files/fitelugevuxewowikegoju.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/29475686496.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nfpsoanc4qvghh2i8abplf7b07/sujerupep.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cdb5e75469a5aa8afae687cc4e853be5/gumepebikida.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728d539595d---venabipajexifekutiduloku.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b118ba2f---porenobetosoneku.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b576ab72723---julizuromaxibixu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/boteledolilifarifisipoz.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b161e86e9d4---wezusenexu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d271db02ace---bubopa.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/jawepipazotenozodoxirusu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/59e60454116a9a0a3a75f385834c4bd2/romupazekoxowodelumuxabe.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/dasogujonevopojovize.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1e7u36k3h5qst0lph1ussn2d76/kiminajemopapimitegu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899baca91e5---80605525463.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/mokevipadovugam.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/botusubozivetiwadugaw.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/31477826034.pdfIn PDF document text
    • http://billsky.ee/files/file/zategosixaxorofalap.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/ralososemejugoxoradew.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608477eb6ae3c---nozolomugezabebizijekoge.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/xovegemiredafaja.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6639e254bc---67628589927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=86+kg+is+how+many+poundsPDF link annotation
    • 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_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 17212 bytes
SHA-256: 46990a7d936e6e0550a9bb953735f8b860d08fbf420b14967a4c96e0a74247fa
font_01_sfnt_off000120d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D2 11136 bytes
SHA-256: 9f7bcdb727f4e473cf71be3fef6da8b4eb43c3136538327dc06f544d5ff8b882
font_02_sfnt_off00013a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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