Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff2949bece34b4c…

MALICIOUS

PDF

131.7 KB Created: 2021-06-10 16:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7c32d08df7decabb4b05bd1d63d7a013 SHA-1: 873d17d7f2ad90c5aeb33eb5919395cafa3ca5f2 SHA-256: 3ff2949bece34b4c8ba09e4f3135476a441d193d36e23ae8427cf7447cb860e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute further malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential use in automated campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9650

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://cructi.ru/uplcv?utm_term=fisiologia+del+sistema+inmunologico+pdf PDF link annotation
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ab49d94c67a---9015742794.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/78255009915.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/13435372929.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/gekiwadevuvamivuz.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bb81782d---3455600348.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/wamarifepaxolevexonet.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/78082525498.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7abs0m7j5gst6fcubo5vjka7p6/bowobixupawaxufelaxavod.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3fea1e3bf---64963264293.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608897345f4cb---94448789491.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/lbhlgjcgmslafh9fdhe3sdmtmp/mowafabegumu.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/91l177phr9i2vm3c0o13rnkhge/bavemasogejomuvut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBA9 5332 bytes
SHA-256: 961f5ab5f558070088571af297cddbd759da3826e4d4862955b030c8399efa7f

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