Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe28cffd362026f6…

MALICIOUS

PDF

68.5 KB Created: 2021-08-09 00:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 35a75a43e5abe13f66a74003fe13e0fe SHA-1: e19150514de6ccee72fa97376ef96f8d79908804 SHA-256: fe28cffd362026f656bf3029f30a998195a4893821779e0fb10eb000a5284e13
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and the nature of the link farm heuristics strongly support a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9f0e271f8---gebewogidufizukotumen.pdf In PDF document text
    • https://morabia.fi/images/file/nijivozabipo.pdfIn PDF document text
    • http://sdds.be/userfiles/file/90517065802.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/wotolejuxugi.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/36326535824.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965a607990d---64650156423.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/64802218262.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/fvlknaesjti7kjdgnm7rqevshb/71122441793.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/024e9bab2d2caca242d20c9ebed3da3c/58937026747.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/xabifipadasamekuwigosib.pdfIn PDF document text
    • https://alutat.com/data/file/tomijemelij.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b681e42d4a---95743926157.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161026b080067b---sukelilomufalojekeriv.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/85868419870.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/jezowesulesoledutasexemo.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4b967t6n7nq1rvgo49pob8hfq3/5015030515.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/93191898199.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ff01cb3caac---77577680986.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/xopedabek.pdfIn PDF document text
    • http://ligneus.hu/upload/file/77984641931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=vista+tension+pole+shower+caddy+instructionsPDF link annotation

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