Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac83bf0b7178035d…

MALICIOUS

PDF

80.0 KB Created: 2021-08-09 03:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08da9628d1295e5e9d380ef93873ae6d SHA-1: a91170162742a25fd7626cd596005f66e6ae1fd7 SHA-256: ac83bf0b7178035d73391e25f448e290f129a53b9de6f0f0ace1e36f3cfdb0b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to potentially malicious content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/55112a289b3943dc5ed52245c20456a2/85283733871.pdf In PDF document text
    • http://adams-gold.ru/archive/image/file/xopomabokujefizogeb.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/696abe1ae1649971d46b817fedad9e11/72630647302.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/15949012518.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/fiwifozeselotexe.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c84c09ff5---97233299418.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e0cf4840a---rolilug.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/39448365173.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/mafotimo.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/ponew.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a15e230c72d---vasowuxoxekazuxofumoma.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/90002737932.pdfIn PDF document text
    • https://kede.org/userfiles/file/89319135862.pdfIn PDF document text
    • https://aspirans.com/files/file/63828700498.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fcdf77f88e038e5d5615d43c56a4bd7/sipakuxuziseragavife.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/328697dce5cf1dd52db5400fc3ae365b/24186171716.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3qtth8nmoe7qu6odd11if7e2c5/zurekosuna.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d9b14c673c4c74c6102976369d65b873/rameneriwoxowevewo.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/44517623855.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/jemesavozex.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/f63ee40c906b615baa968565479ad136/zofololivotegavu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7736dd3fc7---59390114799.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/58460957528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ori+and+the+blind+forest+black+root+burrows+bottom+rightPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210707/16256632723756.pdfIn PDF document text

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