Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7156afde8a480f9…

MALICIOUS

PDF

88.6 KB Created: 2021-08-09 21:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 501cfd7003bffd5b40fc5817c52b6103 SHA-1: 8203497a50068743c8a6d96509dffecfae53f446 SHA-256: e7156afde8a480f91f240a71923bda2b7b81f0c2ddf2c32f7d25eaa451301c19
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://florerialafloresta.com/ckfinder/userfiles/files/xobapodazatakujeraxuno.pdf In PDF document text
    • http://jamessham.com/admin/usercontent/file/92293276702.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/futipijofolikidu.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/wagetanojozeraxop.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/zaxumutujazi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/83fbbe47c55fc190086ab4d0cf7dc966/64698685780.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/59193386936.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/3338777350.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca973c05d7---38974162642.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096075504c69---98706257366.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/febigokem.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/b7ef3ed636691b3ddccb185ff2946ddf/beniw.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/mmhvf7slg98n19t4b3q37fb1u0/tanidukibej.pdfIn PDF document text
    • http://computerdoki.hu/user/file/sosidolugituvipa.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91479042297.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/72144631868.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/guzupub.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ki0n7l3geb7h4npqsng5nodi46/59641990889.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9361d07ce4---minizimoxejisoj.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/b7o64hs5hdc3rdbk0piungeos0/94780572284.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607151dc28ed6---lelufivufuzutakukaw.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/wipawabo.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/pokokawidunewikoxulipow.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a47deccdba6d4068cf6c9cccd82a3b2b/zijivem.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/pojekuremuwevo.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/senenaxabiwinidonod.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b522002ccd8---linikikurabidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+save+as+pdf+x-1a+in+photoshopPDF 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_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 10780 bytes
SHA-256: b6cad8092bcf5947dd03e81bc65a44b68cf8f2598160fda78ea613d5fc3991ae
font_01_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 17420 bytes
SHA-256: a1e05b306f4dab13a257ea1ed739c331a15feca5f547f98628217b23da765e92
font_02_sfnt_off00013b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1