Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ffff2d790be3b0…

MALICIOUS

PDF

59.6 KB Created: 2021-09-05 12:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d930852abe1f3697fa89016931d3f12 SHA-1: d4b1d4544883ae387e93c3b762436884746b0723 SHA-256: 81ffff2d790be3b01265c37c2d02de2e08095f84198d716c62ad05f561963392
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7593

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://chcial.ru/uplcv?utm_term=sociology+optional+syllabus+2019+pdf PDF link annotation
    • https://saikekanglun.com/filespath/files/20210829101213.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kuwuvidesosevop.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0301bcefa---48726804560.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/e45705be17eaf46768dbf2825fcb7449/navunelugi.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/todokesoxurawefap.pdfIn PDF document text
    • https://susta.vn/userfiles/file/19438363850.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/kufutuvorukanilemak.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160964d82eef6f---68732389917.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee1e0c668---karodisol.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/paxilesenetabibu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/18297c855e52c2df98c0eada4727fad0/29104256994.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/q79u7ir1fo84udtidrrhe6j85b/4582042858.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/87637152596.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/tirevefavavu.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///powunizixira.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210627082841_204o3a.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c542b38f25d---zipegupaguxug.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb30167fe7---28545126855.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/duzadopuvibaputob.pdfIn PDF document text
    • https://paperland.bg/uploads/file/32583631090.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4984fa3d40---dinigujowevigoku.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9481dd0ffc7b392d6238c138f4c0c21f/40776071013.pdfIn PDF document text

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