Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f08afc43bd4417…

MALICIOUS

PDF

58.8 KB Created: 2021-05-06 14:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 402ac88fba57f1216fd5d044c419356e SHA-1: 1d2171c870f4fc9595d10646aa3ea09569e3655e SHA-256: 84f08afc43bd44179a4faf41126718ca28ef20cbefebe1aed658e002232bc06b
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The document body is heavily obfuscated and appears to contain junk data rather than a clear lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8253

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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/aj6ekpt2g0bjoc6un9tfd05oem/vukuzafit.pdf In PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c972f72b10---20927087737.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/21650000921.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e099173b8d---mozulavexuwor.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073c38b1c17b---kalamizijanaporaf.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/d8a641871ab1f1a2026f52eceb4f5e85/jufejineduvigat.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092464994b62---57015135690.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/28779174649.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/58729c6cb0f16b3fc7a57bd3b8190616/lagofotazifuwunazopunab.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/k29na03gqv0h52bf24khpdipqu/purovovigaf.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607454c0b555e---mekutujagire.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/ead0d6d7f7b75591d0d388b842275f04/dufikewekijogutugafiki.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7a17a883---puzogawu.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/dudezoduf.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077bad827b08---vesuradejapoxojetirox.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/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gillette+fusion+proglide+manual+bladesPDF 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_off0000cab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB2 5532 bytes
SHA-256: d02e48a5ac0735ad4abcdd1c5fcfb93c94b928cef177dcaf2b005b73643d0251

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