Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb6f9e33b74d2b7…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 09:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 55f2887929ccda5545792f6239116b44 SHA-1: ed105db1919e5bc4eccd175a80cf2286cede636f SHA-256: 4bb6f9e33b74d2b7df9b93269abd0bcc95af61a7386f2e4b2fe6d58aad01bb6f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs point to potentially malicious content, and the document structure itself is flagged as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a930f884a4---ligebifiz.pdf In PDF document text
    • https://weeb.nu/userfiles/file/zoxaxigulaberapupawevol.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/rojofekutoje.pdfIn PDF document text
    • http://teresachild.com/upload/files/59849528997.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086588a23fc9---fefovesadaroxes.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8474a4980bd42eee70fa920dbb6683d2/vibuxozupekararaneparax.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/5911098662.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/xerobotowuguvulobipo.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/mapikomepifi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a843a123618---feniwujeman.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49d1036a7---88545383322.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/18536047791.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/no9o92d63j0d9nunejgs7gu91l/24753723880.pdfIn PDF document text
    • https://bamor.org/userfiles/file/56087484179.pdfIn PDF document text
    • http://www.emailposte.com/pictures/sobuketixojujureledafobek.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/199209462ebfaed99d8457dd7929b6ba/riberavoxab.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/7f387229eef89b45bf6a8fc02d8b2e10/luzetaziveginuvopuf.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/dc6e02bc566ad1a136d2495ddc2e3fe0/sifofamogadizalivezafu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/22ee68c60222bf42376c2fad85a9b2a1/dofefozuv.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0sd83dsq9n5op53d61smuirb7o/wedogibanegine.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/p1e12jpjlh6qc304bcl2r204t0/libasapufasutemew.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a548addc844---sutasanawave.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/da55d5c4b791ed02393197816a6217c1/jamorukazanixarixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=genesis+chapter+15+commentaryPDF 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_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 16984 bytes
SHA-256: 94acaafe8ffde8e531c39ccba3becef48ef7af7b914b2e279d26828ddea57a2a
font_02_sfnt_off00013634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13634 10932 bytes
SHA-256: 053d04b1e0f88a6e3d3f132be6c69ab02733d6224dfd8457fc25a2b2e2044105

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