Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d23aaa8209661b…

MALICIOUS

PDF

44.3 KB Created: 2021-10-01 13:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 45a53d03a07a05dddc7e21cde3b90655 SHA-1: 87ef1284e227215ee663bd0a06325dbc4b745047 SHA-256: b3d23aaa8209661be5dae041ffcd4b80ff8089433f76bc9fb20eb542e7228fb3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true origin of the malicious content. No scripts were extracted from this sample, but the extensive use of external links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7472

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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16147802184fbc---fevuxaz.pdf In PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/29791970521.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/vukewevadaduv.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/13496219341.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/wotomarakalagetiwota.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/26327715055.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/fupawulokapakaxe.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/zefuniv.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ieb4o3vvieohqn2naebitgn3rl/7388339580.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac8895c98---bagenipeviwuxajiwida.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/12415610880.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/fozotenexajekipe.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/rorisisoraka.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/lanatetupo.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/difidawixagosekila.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/87055566250.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/babejikunaganobugun.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/37b5a6a6cfb16fe81958699ecdc048e2/vanejeriragegewugifuvawi.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/11336a030d2f2d70f5663b895d2a5a03/52759716641.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210908_61B8B7D9657C7943.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/misojux.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/26690409072.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/tematisurerim.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/litomuxilurewowow.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/viguginizafebokaduloxoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=parabola+general+to+standard+formPDF link annotation

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