Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d765940572ecb6…

MALICIOUS

PDF

75.9 KB Created: 2021-06-14 13:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3460dbc254a3da40edda867c6fde6a57 SHA-1: b70591ff963b89ba0acdfbcf2ea3f6580d6f0050 SHA-256: 26d765940572ecb674ab40a47bbbf70af682f345f04caddb93ad1d1e26e45c0f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI heuristics and link farm detections strongly supports a phishing or malware distribution attack pattern.

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://medvor.ru/uplcv?utm_term=change+from+direct+to+indirect+speech+exercises+class+8 PDF link annotation
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/faeb9b03024052249a8d8bf11706e070/dexifega.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4e7560ec23390b3b1eec6346d7cc804e/9461851791.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/85500805928.pdfIn PDF document text
    • https://artbynela.com/uploads/file/15015407758.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7283635101d20fbc8829acca84cd515a/61545246231.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/51982550670.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/butir.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6r52l6s859bg5ecs84mmrh4ft3/jolivalage.pdfIn PDF document text
    • http://wajl.net/img/file/20216810642.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/90594009619.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3f49c28be1bb44f12fd3e50e0eaea44d/zazofivuduzobosez.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3f0abf7f0---sukusenikebeberiteni.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5b552d2578bc08156de1f4310615d645/dosotevidezotojigi.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/83128162585.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/fc7509e0d8185c58d7fba9c1ceda19ba/26865221268.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_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 5736 bytes
SHA-256: 29885de5a75b9960ea53cf06068994251f7cd10bacc440d551f13dc87151744d
font_01_sfnt_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 10916 bytes
SHA-256: 1760b2f46b259ef276df8946fb8073bbe9d477226ae17ed436732358714c4e73

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