Malicious PDF — malware analysis report

Static analysis result for SHA-256 956e3ec53e1929fa…

MALICIOUS

PDF

74.8 KB Created: 2021-07-26 12:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7c8c86a8b17968cf1b926e6a6d32492 SHA-1: 95eed0ba268e249e82951419dc0d09497ac4bfd3 SHA-256: 956e3ec53e1929fa4117f700e3927611ec910b8806304562166dc5462553c795
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URI information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8910

Heuristics 5

  • 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
  • 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://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c31259235c6c715e4b86ae23e00b8eb8/89725324710.pdf In PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/7883734522.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/fatexironiv.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/62406568354.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39f7c97374---rewefakezunexasosi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a3caebb5---45950683040.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/tepokem.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/begemopemowokuxeguk.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/muzaru.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/36568f4c94cc768650cf91744e56cd9e/81580295810.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/bigakerirunetu.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/34734377129.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767546058cb---mirogipamo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/97ed4d11fb58c9e36c8fcb96b4a20d77/42277136027.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/deluxi.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/3gcdq4i4k18pv7t17srlg8h8cr/479620765.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/lirezasukadezowekumerisat.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/ligipen.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090e0ab3571e---94865507658.pdfIn PDF document text
    • https://elektrona.cz/files/file/mesozin.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/35642835975.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9f5c0d309---gebogiwerebogonoruj.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/76728633459.pdfIn PDF document text
    • http://szwygs.com/upload/zuwafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+tiktok+followers+no+human+verification+or+survey+or+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 17304 bytes
SHA-256: 9c69a37223fd3ea7e7d0910b03156ee28c3c4628a2c5e17f026f861d172ecbd8

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