Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d823e6c4d928c0e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 19:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36fc7ea5c107f885c9acce3645253b00 SHA-1: fea34b7b1a0c54faa629512833f4a855e2edd818 SHA-256: 8d823e6c4d928c0e1ddb53c9fc73de4b29de62bd567c4aa0ceddb1ebf1c2629c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. The primary attack pattern involves directing users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=company+of+heroes+android PDF link annotation
    • https://haltia.mx/sii/ckfinder/userfiles/files/99897071165.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/78540919818.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/birevuboburepareloganuxul.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/56879290392.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/87796720004.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/vitazi.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/fatemowazivanubap.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/pijakupuxuvanijarilomur.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307a798197e---xirekojoxibugefovujuxexel.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/pudoduvelurogafod.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/vemupedaligatopepa.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44fd72106---26993755913.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/15829235685.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/palenat.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161352f3a2df2c---pakaviwedofodiwamu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7ba0074a5---10704282916.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/gijorojerezarek.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/51974403388.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/78794953533.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/60048893782.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4e5d205d---jifibudoxuzatepajuda.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 18120 bytes
SHA-256: f5bb9194c728634d0be527d1529f3b3ff0392703d015bde689a8c91e4b553511
font_01_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 10764 bytes
SHA-256: 0245d0b88e14f671e28a070502bab93b241a14b6cda11515a67efb058628ee43

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