Malicious PDF — malware analysis report

Static analysis result for SHA-256 961675d966875fb1…

MALICIOUS

PDF

70.2 KB Created: 2021-08-04 02:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 607556409e0f188cd39c0e0c392bfa34 SHA-1: ebb357b304afa83a042a865e731486d8c0a73a02 SHA-256: 961675d966875fb16f7c0ba6ed9097e1e8fce114d48944cad87fd2f4c3197d66
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ub1f79kp5ourgrhlojmfoe7rcf/durelu.pdf In PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/4aprq684l6759va1m26hvsho7m/43000032487.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/peratakarerusirerisu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/45661449175.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/42686460232.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/lerapefazo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a8889650a70---mujuvuwimotube.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7714e57367f27b204be95588e85612d3/mufuxa.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f563a12d1af---xugigaretulotixixegizo.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabac61559---fonip.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16078d73b55055---70659981252.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ffe7969f---2928579147.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/c9956e5ad30087fa0291c34b8ec74474/84048847280.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f89e4375b1d---tuxivokozomibosamugaju.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/musili.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/f6d03p9o56bob7t41l989i3g47/nodukivimada.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/30392757732.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a4c477e2f---roxagakesorowuz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16feda2c7---ralegezadikebiba.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/q24q9iff1hmbubapljsciqi0h2/sexijasafikarezaf.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e6b1385e---muxezeji.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210706071921965.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5c0cb894---57784525004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+survival+for+the+fittestPDF link annotation

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