Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f641220b7e207e…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 04:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f11663f9d7f2c403803c3cd053000fcd SHA-1: f6a4152f0446d9fa38d1fc9b25c5c6e5ccf567c9 SHA-256: a9f641220b7e207ebd21515771bad03552da2d991987cc69301596b0a2f80ca5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The primary attack pattern involves luring users via these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=plural+of+torch PDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/aac85ae0e3b10d0bd9a040831ba444f2/bukozose.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/78839911623.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/c6l2j7i5ov6ahubkpke3l7bbc7/jefewos.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46e8e1b40---57767501111.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078942263b63---pelavadazosa.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/m5k8ekuugt17rlia7ikbpq85m0/39553372845.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/4cadc5003fd7fa761fe0236e7c8b132c/kitag.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/69441416747.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/gaxokafekurajivirotaji.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/6pobspkvpff61bhlrr9toej12p/57496424783.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca0938401---71368379769.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/denubaxamujum.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b5dfe435e---80632996914.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abb249a70e4---satijelojupojegazorit.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/pedobijuxisus.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/linusarilibopame.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210617200428074.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f293e1afba---jaxik.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098635e2efbd---13077877797.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a753d6df5035feb6cacdabb7da653cff/gezanigafetofakutavi.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/6u1dsub9kutml79v9e5eosq8q6/7585069567.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/0rrsgc2l7gk1jdkulavb3cvd8e/12639305956.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_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 18092 bytes
SHA-256: 09083c1a81c3606391231e608978fd3b67ad834bc69fc9f5f624e594ccc7a4b9
font_01_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 10040 bytes
SHA-256: 49a5cc03ec303dccf007b417257175eeeaac4b57d8f0b028f0f4dfd8666946d6

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