Malicious PDF — malware analysis report

Static analysis result for SHA-256 48843d3cfca3c7b1…

MALICIOUS

PDF

108.2 KB Created: 2021-07-24 17:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9f174bd233856a53e9b6d5d2db405475 SHA-1: 266ed3b16ed30e1c2c4f886aa189f453e028300d SHA-256: 48843d3cfca3c7b1c41cba6bebec24d271d3733b1b5da7e298526eb82225d138
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7451

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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f9d76e034---derunaduxebiwe.pdf In PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/83645459024.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/96967573478.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/kipenolutabanapol.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39127a3bb---65064920252.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ba3c246384733f6ab908709728b4787d/30718174669.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c15e56889cd4086fd4818bd6ca3d4c54/45302218118.pdfIn PDF document text
    • https://sambelteri.com/contents//files/39133007640.pdfIn PDF document text
    • https://dm288.rs/slicice/file/89986168160.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d1650c58231b2e4ae9e81cb1ba243ce4/28581156504.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1629a9bfa9c13132c103291de748414c/33886956073.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/terufojizufimoz.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/miluro.pdfIn PDF document text
    • http://ezibra.pl/upload//file/90995259184.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/14856335373.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/34536778418.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/62c0b961ba45b014c4492a159cc9919e/zizonesufejelizoto.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b64bec64c2ea07437c8c2e2944304864/raparovelu.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/55512683697.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/piwoxebakedoled.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90202d8aac---boruzogabubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=english+file+pre-intermediate+third+edition+workbook+answer+key+pdfPDF 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_off0001717a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1717A 11392 bytes
SHA-256: 631e328960d93d1da4643c400ab0c4f2d9e299957802b5ecd7b44a9f3bddc157

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