Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f1996ac794bdd2…

MALICIOUS

PDF

62.3 KB Created: 2021-06-18 20:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6dd9069b69029714b083b9aeb87c7751 SHA-1: 1dd17534b1adb68657e2f4eceb06dd254fb84768 SHA-256: f1f1996ac794bdd2fde72b249673a23ed3e71226f52636c6f9f3422c8aa54f32
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites and are part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of multiple links to potentially malicious domains is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8027

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 http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/60707891601.pdf In PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/zixumugetalamedibutojale.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b7fbfe44---71894731712.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084f44bcb36e---kepokokaronoluni.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c69fdd81a732b695e4f4346f3a5dcee5/84907527826.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dvdiri87491cbi0iei1v358j00/gimamotoluko.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/zimijusofafobep.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/tajufevu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845f98ad87f---43127500868.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1599226005e70f9dcd07ea00392f2644/8365771502.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/narex.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/mejakofasiru.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d2b471fc---jegidisokabafogutafo.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/12434065878.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f86303da6---46876825322.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160738d88dbf34---80379565425.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=playing+to+win+toolkit+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 4864 bytes
SHA-256: 3f5ce16ea265041a9bc804fedf14d9ee4782b8a1ac7c7ab9c86ef864745b91e5

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