Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcb4042a8f6880b…

MALICIOUS

PDF

83.2 KB Created: 2021-07-08 07:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b886c65cb33b9acd814d65c9ef481e10 SHA-1: 9660de758ff656ed488ab8423bed4f539e2a410b SHA-256: dfcb4042a8f6880ba705f3e0a39897daae587502fcefd80b9133c56b3e2a2581
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute or host malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO poisoning attack.

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://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/nufiwetifube.pdf In PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607596640a9d0---mexuvinidesosutus.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3c879d18253eda96ac4f10e9b50505be/wozidekadovumofokat.pdfIn PDF document text
    • https://mszukam.pl/dat//file/fawovareveb.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/54508035975.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dda9b11cc5f5c8149292996618e97cb/fanozuwadolamubidu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2592b917---584466121.pdfIn PDF document text
    • http://hongdacable.com/d/files/14301443747.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/totilupufadalu.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/77829444915.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9810dee2114acd26e0044fb758732752/sumuwiveviw.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098715a63bad---54268467950.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/damadenezuk.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/71347530209.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/rupimurafixopogakeleveg.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a43e16619de---62744583711.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/fenapowoz.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/lidekukawitozux.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/76617679019.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/34298ea6e89711197391296dd2d77dff/11485915785.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f296b71d76---26846893284.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/guxebagoti.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/turak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=olympiad+books+for+class+4+pdf+free+downloadPDF 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_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 11216 bytes
SHA-256: e5928371f9aa44790cc6f60d858457d941f3ad46a49e668cb3c712c029f54bd5
font_02_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 17540 bytes
SHA-256: 3bae786f93deb9749d63bbcec84cc383151ec3da007aefd51a2d6e81ab0fc06a

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