Malicious PDF — malware analysis report

Static analysis result for SHA-256 106c4a6caab6abd8…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 20:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f029f0ca7d1c97bda8c213fd2c127815 SHA-1: 9e4c883d0c732d9998194c4dc4f05f410a9eacdb SHA-256: 106c4a6caab6abd8f617e9b411bb428ea4af11118881149a1f0e159f2cfa6f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://3e-machinery.ru/app/webroot/filesfiles/sivewuwukavuxu.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/bbc6ba45a112e767459548a111e9e9c3/tokiseg.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d61b96f9fb46baf2431ba006814f0ce2/66105674837.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2e4801d8db52bc92729d5f0381b1b0f9/47100927041.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/nenofimujexufogamewir.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1b41fec02647c7f0f503119e25baf7b1/dibolarirusupuvobo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d7877b9d2---pipabamifas.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/db8f2901238f21a5074a10fbb7791fca/6491113198.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/jorgl644n973jm5n015c0opht7/57149669140.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/gukisazesarirekazewin.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/vavifojolidino.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ulndm6kb8mrbta3urcm6ac4dfd/8039921435.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80db674fc---90246260612.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/bijanarobeliwopiwe.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/tozatibizatenivuvuba.pdfIn PDF document text
    • http://webursitet.org/Files/file/korisijedirevela.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8370c38a1f1e8311950d69a59ea62d5b/96870422270.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kegagupoder.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/25194871087.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0df9be66---jakomawelerule.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/16u8h8bi9ctbkepv5nclajcdli/natijamonodo.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/baforiragiserifur.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d543f385b3---66643147513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=actuarial+society+of+indiaPDF 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_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 17380 bytes
SHA-256: 7a0500030fe09f16ffdf74113b2b32137e72066f52c6ff839d89d9df8825bc69
font_02_sfnt_off00013041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13041 10664 bytes
SHA-256: fb4223a7e63137c50b770d5bfbe7e185c3d990d52fa49b8c71899b33d8d95661

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