Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03c3498227de41e…

MALICIOUS

PDF

62.2 KB Created: 2021-09-01 01:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 517154750586af83dca7dc83cf95979d SHA-1: 4a7f802124fc3bf66c0167b657cda612e346d551 SHA-256: c03c3498227de41ea4d6524ed63bb8d4b35c0cf6e5d5c0858638b1187725d385
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely related to spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9424

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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/6615d67d58aec8688eae15c203401db6/91126420563.pdf In PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739bb5c35f9---12925339904.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/pidalewuwuruxamujis.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/26760124219.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/74q9d9r9emunh4fv1i0p5ana01/lejopupukefokigenaguvu.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/93862836568.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/xulexer.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/98713716038.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/81963021729.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dada8fb4e---vefuvewonot.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/30470976029.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/revekipos.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab486830c---753893826.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/timemegalupomevipewubilum.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/69752963320.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/4c46dfvi8rnpng7eibjn5adf24/81221291565.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/livipe.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/eij7jamf80daerolgsuhpvpa5d/479105453.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/97479595190.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081e422a5bfa---tuduxenidanufa.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/tafoxufifexo.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/c69085052a06a7e6b176bea7e0c86e56/72067944126.pdfIn PDF document text
    • http://benetalent.com/upload/files/33893523921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=methane+25+times+more+potentPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 10720 bytes
SHA-256: 4c576413be40ec6296a06dbf93a0054d6570737c1408264f3c7aab634aa6baec