Malicious PDF — malware analysis report

Static analysis result for SHA-256 3caa6e34af8de210…

MALICIOUS

PDF

73.9 KB Created: 2021-07-02 07:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f5f4b625f2c47b290ea383e71d174d75 SHA-1: 675b851634c61b6a29108c4629dd4f80ef6374b3 SHA-256: 3caa6e34af8de210e18e1bd89e3920829cc01ed0f85095c3ce1b456edef632ef
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h278d7r0dv9djbhd56uufjbaps/38651601499.pdf In PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/pozopijewinatukewado.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/fusuxofe.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1dfc397a3---juxitojajajiwokuv.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079615c19de4---43225045160.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18ea824b8d---ruwokijime.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607531fe3b4e6---92768613315.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/bugajukitupozerenapejupi.pdfIn PDF document text
    • https://ancoraeducacion.com/images/ginelerufimunofizip.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/85636225259.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/64407510553.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f3fdcbcf2---lokama.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/16742935910.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d36e4974c49bf9b6fcda13e68443851d/3020100439.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7cd6aa47634e72724e6a717cce48c590/52610094323.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/22135287919.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/qdsj8b62qqn5i4bde2901nad22/lejixazewame.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097a4eee36e6---weniravo.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/76484994609.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/vubebusujonotelidu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae3dcd6d46---78511190402.pdfIn PDF document text
    • http://veivel.com/userfiles/file/faduwub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cute+screen+names+for+dating+sitesPDF 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_off0000bf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF22 10904 bytes
SHA-256: a0e4125ce1d0ff23ae35662f6fc14b9698ffec65aba8ee7891e225f94bf798f7
font_01_sfnt_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 16292 bytes
SHA-256: 8e16c5c24542f41b30049132a1c6e4af73f335f2d89b725e9ce95851e389ffee
font_02_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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