Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ee2c5e24a7a805…

MALICIOUS

PDF

63.8 KB Created: 2021-06-10 22:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f677130d336fdba135e6cbc8ef27bb74 SHA-1: 7f12260fe7b58b40aba0b0bd1757408bb30db123 SHA-256: 54ee2c5e24a7a805781e98385af445c70e442fd993ecd7b8d0f0b84dee25c23c
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress instances, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

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=free+android+xml+layout+templates PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde5eba2a7---depubixexuka.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/lurupuzegepasejafo.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a27af3a8---zejukagul.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210524170319.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/75383556443.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/r0pjschljj871ltnme7t1bjjn6/nakulerusukozavev.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/hqgnq5l035b5jelrmjlhhli036/45177966305.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/97eba6d83329d2cac88c7903d0286a28/pukedatamagu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/2p80htjfgfsqiqv42t5799t409/20275961491.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c149bb99d68---75169322393.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/fapavi.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/sijufugifujur.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/polurumimujijo.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/jononenosanobidevo.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/d1c3423194d51f53b4b42aaaa191a2fa/kefuvuvo.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_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 5228 bytes
SHA-256: 33b2e9cb56e517a23378c49c35033456025be46ac98e70453a04e1c1af048d00

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