Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffa273cb98fdff8…

MALICIOUS

PDF

42.1 KB Created: 2021-09-02 17:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7db3599ebf4c45e3604897180bf22dc SHA-1: d409f8dec1cccae52679944d12fda49478687d9e SHA-256: dffa273cb98fdff82d84d097558182bacf47d96b5eb58167c8b1c1ff33363608
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a multi-stage attack or a sophisticated phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8710

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 http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd74b9cbe5a---tegejagiparuxubelituz.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/58q1so3nqhe02oihuf6pgt0hlv/28174840426.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160776bb7bd458---50182492807.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/43732331858.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/98282184483.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec524dbe38---3962513587.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/sapisafonilalave.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/b52c92b13bf185bdfde4b10aef379bd6/79211977169.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/74701101592.pdfIn PDF document text
    • https://norservis.cz/files/files/94922298276.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/45457266638.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/50344237617.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/jubumavoji.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/xakefasazuvazaviri.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/7b7cc03bed0feadf00619a02ca994c9f/43676632852.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/55273152725.pdfIn PDF document text
    • http://limoride.net/gallery/file/duxomufixuf.pdfIn PDF document text
    • http://talleresjpg.es/img/file/sopur.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/mevufupidirujumolewonaz.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0676fe5773---kekajadotalejopixewek.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfilIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=diplomacia+y+relaciones+internacionales+pdfPDF link annotation

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