Malicious PDF — malware analysis report

Static analysis result for SHA-256 5667bcf6b7cbc747…

MALICIOUS

PDF

86.2 KB Created: 2021-07-03 07:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b174d51118cb118dec8547b087ed5433 SHA-1: 1944d209a0bdb0b8585b2acab4d5578d054cf1f3 SHA-256: 5667bcf6b7cbc74752ecdc813ae3bd5d5b178171f8446470dc44c8b150e217a8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of a callback phishing lure heuristic suggests the document may be designed to trick users into calling a fraudulent support number. While no scripts were explicitly extracted, the nature of the link farm and the ML detection point towards potential exploitation or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://dzbnf.com/upload/file///loroxew.pdf In PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/givulufalujewika.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/3797c6c2e81ffad923ecb70c0179ab17/xawamixilikixidubigomaki.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/75069240788.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072ba5e2d95c---22636043760.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c676c1b3dbe---58930924284.pdfIn PDF document text
    • https://equinox-e.com/upload/files/silugexusen.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/xisisuzujejufofokabogex.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/568a44b95809a988a4425babc7659a8c/85953992167.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0de8d8a8a---85807106182.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b5e5c412---21553955165.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/rekisefetujenutuwege.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094876838e41---94296128853.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adf2e12a690---513642970.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/87870487317.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98ca1715d0713f5d816038fc885d421c/kigevesuditonav.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/gipef.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/5bbc07a2b6849058615af166f9b53290/1206721199.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/67584137059.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/69678412106.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/mivirami.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/24604247530.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/janobopodimofogila.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/dda52bd3ccf2e1f1c445bba945568902/dolatubo.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/1441a932ab86376e3ebb8a5e8c7c2e34/10812897544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+many+black+cards+are+there+in+a+deck+of+cardsPDF 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_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 11164 bytes
SHA-256: 2fe9993f97c450ab70b0517be21786d06c0969085c1e5f40bd2de7fb4dbba9dc
font_02_sfnt_off00011cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB9 17640 bytes
SHA-256: 013db70d17bed628e906c1069e4f15f7cd25c1bd7c286fcca4e132306bed0754

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