Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0186ced930d98e5…

MALICIOUS

PDF

59.7 KB Created: 2021-06-11 04:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a4f0631eb79e0e484ad430e3647ec3b8 SHA-1: a7b72f11bf30509d5430b66a884677d5e73ac276 SHA-256: d0186ced930d98e53083b048abf251a1d0171995b0fe1799bbbfd01fcc2c8249
154 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting and the ML classifier flagging it as malicious further support this. The ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7927

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://pixomot.ru/uplcv?utm_term=the+developing+human+11th+edition+pdf PDF link annotation
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843957e4339---zefefonasoxikutasu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b54bdfdcae5---siwimexaf.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/dae52cee66f6c53f56de2cc400b89558/58382403170.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/87ab5c4308f33ffbe6de0d4de9693a74/goxinopufutunisazuxu.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/19351640143.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/272cl6dd38qaijntaftcd7748a/24869635054.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/bewadozojix.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/53639144057.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5ce5c89e---sujeseripilitepisanud.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a96a1202199---zabawavukifokuxugiduze.pdfIn PDF document text
    • https://alutat.com/data/file/koxefe.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01b102e5e---forixedibisexipujagabupud.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/werix.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088b90cb786f---62539523821.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_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 5244 bytes
SHA-256: a1ca2879000868ed4c50f64a7dd55499596ce9a2e6eeaac3d762003ca54b9f60

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