Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f51ba1a9fd058f…

MALICIOUS

PDF

60.4 KB Created: 2021-06-06 02:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8a5bcc5f049d51ae8576e62545b33a11 SHA-1: 17a174f91911c7f46084bbd1e0f1ac5dc2072a66 SHA-256: e0f51ba1a9fd058f00acb88d8aac4e316f48c58c86f7cde660adb39cf6c0fc7b
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body's garbled text and the presence of link farm heuristics further support its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

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://philabc.ru/uplcv?utm_term=what+is+the+best+portable+power+bank PDF link annotation
    • https://chp-travel.ir/data/file/93513609264.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/830fb8f7d947282afc6aa4c877dad01b/64901550286.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe6840ebd4---25127966626.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/pefupoboj.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c6bab7824---mapodoxerividolitukob.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/fobukidufawufonijuxinano.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/27973552447.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c969cb87b---19942635092.pdfIn PDF document text
    • http://www.asslar.de/downloads/47696416878.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/72473673463.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/58462272115.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160797e1b9c31d---81508745363.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/xukimikigisivavafitek.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607122f6d8993---robose.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f5e15fd79---93461861332.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_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 5216 bytes
SHA-256: 2b204cc885925271206a53b2e4f2bf873277129a5a4edbcb355dd73a36b76d4b

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