Malicious PDF — malware analysis report

Static analysis result for SHA-256 981890d454ddca22…

MALICIOUS

PDF

88.8 KB Created: 2021-06-18 04:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 076a4b613f1e8df6c594bcc48bb1108e SHA-1: 4667f90590c63aca62621d60c90c6979d4a2125a SHA-256: 981890d454ddca22e795e184b86d1dffbb63f78d61abb483770374b7448212f2
162 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9501

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://msslink.ru/userfiles/files/xasevuwiwatom.pdf In PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/dcdeebf0e8ece1964e5916baabbfb462/20199751378.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/63425891854.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/poberiruni.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/51956563296.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/suxetis.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lirotogabipenofeloluritom.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/aaed1fd197b580e9a0e1f904b103803f/bubibumedo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609555b60e411---pofekademebub.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0634b5bd---gurewimatewawatum.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/fiziviken.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/78520490086.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ede51d2d6e8af35ebb59d110ad42a2e7/42247711884.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/000d833ac7337f9851ecdf6a80ce2d4f/bakonofon.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/48198668058.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+tanks+in+rise+of+nations+robloxPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE9 5028 bytes
SHA-256: 14028adf7ba6cbcf766298b2807df73b4304bfe00f669a5d4d21ba689296f870
font_01_sfnt_off00013eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEB 11056 bytes
SHA-256: 78c85da61c4f19ad2ebd0d5797e9cd9235e449a08c682f67840843118bc196fe

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