Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e8e1b4bdc038e1…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 10:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3f4b76b8adafc94c428e049a278ed64 SHA-1: 1a46e58372e9e46de719d373a888b2e9254c8ac7 SHA-256: c6e8e1b4bdc038e1358c5e074eab59ba37c99c7c3808d80da236124e1260c11d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of PDF-specific malicious indicators and the nature of the URLs strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=rounding+off+decimal+numbers+worksheet+for+grade+5 PDF link annotation
    • http://tecsun-moscow.ru/docs/file/50953321357.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609133de5d30d---kojimokegafeme.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d25cf0462---ropekabedemasekosukoxew.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/zizaloxodijopewuzopu.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/besugulesuvelelazaledup.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5eba39c632fe9043ae40da9549da95a6/85052811265.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c8e8f89c---22139177804.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18dab67a33---zawiforulavezovagizevaze.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/dujekurusuzorufukuj.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/mukaxodamegiwuwu.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/23659344004.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/rutixevaw.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3e2b1bd9a6a3bfd1ecaaa0d6ed1ed713/wemijofowelepibabije.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/47941637680.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/19057526204.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1664f10d50---64021133024.pdfIn PDF document text
    • http://africareview.in/userfiles/file/87176172055.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/36179483632.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/4982319987.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/30133100808.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/jefuradifesexof.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/xozitutemebov.pdfIn PDF document text
    • https://daismene.it/file/lekaxudevukuvanamusunadal.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/79550888205.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/veruxafikezivufunapawevoz.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_off0000cfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 17388 bytes
SHA-256: 6020a3e528b49c54c4edc2b67d7f6f7a934883ee577c10fbe554e736d2932615
font_02_sfnt_off00011471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 11520 bytes
SHA-256: 3431d1ca0ac1523348d69608efbd7e4f14f1b2b54b2f09bf284ba4d62ea5d7ab

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