Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b9faec3788c086…

MALICIOUS

PDF

52.7 KB Created: 2021-06-29 10:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 923aea2549ae6dcb08881425fd0f66dd SHA-1: 077b354463ddf4d8149862c4ef9b9b72a76e4ca9 SHA-256: b3b9faec3788c086c6b51ac9fc23e69616c6d6df95a4a99e42a49c91d2b15919
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. This structure is indicative of a phishing or malware distribution campaign, leveraging multiple layers of redirection. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8679

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 http://alexanderkanevskyartistbiography.com/clientMedia/file/94648088045.pdf In PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609450eaf14e3---tibetizokolid.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad277bee3---81589003885.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/22758732407.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/35450940977.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0aa13293d---82354107924.pdfIn PDF document text
    • http://sammyurias.com/userfiles/files/terazuzelowavo.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/11a98097c1a3ca63e18ba6d9d57f7e11/70650296156.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/2b7ab61dcf3fd976e6fc85a69230f773/numeritigudusijakiw.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160852c850ffc9---53334191032.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/83431434980.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/jenimubatesipunal.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c03460722e055b131cd70136d8570140/panawawigazimubarumonab.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/96168315162.pdfIn PDF document text
    • http://thedreams.cz/files/73878808696.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-3/20210503015113568642.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081192bba4ee---36747183050.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/benoxexatefegefijip.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6e8b1665---juxumilitazepulogalago.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/munepuziz.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f516f96677---bexiz.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/446965332.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/nurugopofujekovofifipu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1365be5fe---tewogixan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sanford+and+son+ringtone+iphonePDF link annotation

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