Malicious PDF — malware analysis report

Static analysis result for SHA-256 7306e938e1e2a574…

MALICIOUS

PDF

72.5 KB Created: 2021-08-28 07:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57f1785cf579478aefe8008ebb1a7d6c SHA-1: 382df8fba0fefa29b7a4fc4cb1e6b15df5a8dcf4 SHA-256: 7306e938e1e2a574966edd708ba372b8c70893362372ed98e59872a4dd6338d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded content, though heavily obfuscated, are consistent with phishing or malware distribution 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 https://laborke.ru/uplcv?utm_term=fbs+reinsurance+limited PDF link annotation
    • http://vitanova-cattery.com/upload/file/43643320494.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609efe0e7fcbd---36647027534.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/47237665602.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/55739668689.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/dufavetepuge.pdfIn PDF document text
    • https://faceless.me/userfiles/files/36290520846.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4d28df6876f102abf20770d7293ba663/1624220610.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/92018629522.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/8ffee4972a9f67b9673fd5e2e19f07d2/91010080097.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/wegugex.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/77904140532.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbb36d9c37---zipenomovigije.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/12cea6acc0f784851b468309d91a296f/94375107609.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a203c2eed85---41545638513.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/keferivozanovu.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce900215076---27488354722.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rumowigelobiber.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/40287633947.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-15/20210615024505614342.pdfIn PDF document text
    • http://salwex.hu/file/tijabipelewinedutivew.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bf4acd05aa04dd841eeaabe9c3e5509e/32106013385.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/81016197708.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1e54eb808---23527697451.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_off0000b9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 16684 bytes
SHA-256: 8956f5ff852bb0c93b65d55ce1f5e9718c42f645f6616e804814aa65bbd01b9b
font_02_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 10628 bytes
SHA-256: 0f0f069d7609c76b7a2146b5d4c4d9e737944a7d163c9e688c6dd391204897f5

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