Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59d17eb93cccb81…

MALICIOUS

PDF

89.3 KB Created: 2021-08-23 15:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37863954070e04a7ccbd86a3856675d5 SHA-1: 48dd6c418129b1ba245d883094921d6fe18b39d8 SHA-256: f59d17eb93cccb816c665def9462c2b2e31d8dc00bfa7b9f686b94bb6d38aa68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://kingsfinancialconsulting.com/userfiles/file/99913088328.pdf In PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ada2586f12e8a687cfbc173fecb45b9f/24841870257.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b13f68bc9---20140992788.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/62522457809.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/badezopesotogof.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/xarukeporegimo.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/73142847491.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/92348116178.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c62386842f7---ribejododetipatirimimem.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/25602093237.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ecaa8ae215bf47580e0ff293e2209f62/viren.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2d36b994---guxebidazomabizevo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c6c54304b---68630357081.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/gojijejo.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ffe7ce78a---noduxep.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/gaguvojivuvowesa.pdfIn PDF document text
    • http://accronline.com/userfiles/file/sidulipewaju.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210713045813_ra9ams.pdfIn PDF document text
    • http://muszempilla.com/files/file/mijixosopugosagened.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8928125f8d---93602045620.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/67772364182.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607137cf10dba---fovugosalul.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1ac1b130e087dd5117da5d7350d8e443/57021019159.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949feeb31fa---tatuwimefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=naturally+occurring+sulfurPDF link annotation
    • 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_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 10572 bytes
SHA-256: 3bf7821571b0b4a47a86fdc1d0400a6ae6c1589effc8944494013df43a847af0
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 18532 bytes
SHA-256: 1e62a2258dff53e51b6795b70c25b7e55ebc45a2f1a3e31c180c0b31caf70126

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