Malicious PDF — malware analysis report

Static analysis result for SHA-256 637cb6025af55096…

MALICIOUS

PDF

68.8 KB Created: 2021-06-05 19:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b09c9a2715505c66a696f2f5affeea50 SHA-1: b5f3b6e5b442881ba4a35ddf7c9e38e6dca08332 SHA-256: 637cb6025af55096d9fc8a77e6207b59050633edd8ec1475b29211acfc578542
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The embedded URLs and the document's structure, which mimics search results, strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://archism.ru/uplcv?utm_term=what+is+fatty+liver+in+spanish PDF link annotation
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0dd6d9d82---81281844800.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p3puglv7tknuc3vh6i46escq5n/kinaketu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d2781d6e1---20966574997.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14e38e401---zajumujuzuxudipuwi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160983edf0552c---polibena.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36d3414e2---81496271321.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acca4c74c18---1149338804.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd10aa4bf---lonivepevogiz.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/77686165001.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc5dfc46fe---zejojobedupuxulakene.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/1985618727.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/movabukosemilisiku.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c0760bfb2---kerabumosudevu.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608138877ef1e---wunodokafatovuvemedi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 5164 bytes
SHA-256: 8c079756634cd3b0d9463dcb840bc64283bd98cf8e120d8eb375486f828c5551
font_01_sfnt_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 10220 bytes
SHA-256: 58ecdf0f4dabe862ac0d648bd73c5ffc138f34761fe276a30a60ddf069a4deef

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