Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c77e8cc4bcaf5fe…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 09:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 603a1a8603d02d3b0bf5dc95866208c1 SHA-1: fb0f83219865f0383773d6eef56ba0c7463d2bae SHA-256: 7c77e8cc4bcaf5fe8822b3b73e70b65220e62fcaf867b34e310ed9f7a6a43bbf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The file's structure and embedded URLs indicate it is likely used as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crewmak.ru/uplcv?utm_term=kcet+10+years+question+papers PDF link annotation
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rhvt0tpu34u09tm1tghjd0me52/28014802020.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/pibopemusi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bac9f40a89e---xutuj.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2526e714b8---kedozegexetewilafem.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/50227648812.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097a85be7fe2---miwikudijed.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/93392785622.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/0d5a27c0eb71344cb6d9973ea451d2f8/laxigumadudakapaxev.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072682b4aa00---newimebupu.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/55461748993.pdfIn PDF document text
    • http://zimmerei-possert.at/10100828114.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/lr1iouh4bmfto1372jobo5t49e/wukalizibimelixepeso.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/nevawufetisuxet.pdfIn PDF document text
    • http://weclassof86.com/clients/6/6d/6dc59c75684a9be5e3a4726337e2fa3a/File/toxedur.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c9fed6e2b---kiperotajufofadepuzo.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/76029748569.pdfIn PDF document text
    • https://eklyps.net/images/file/debugizilizagenogo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd3394c535---soxafikovukuzalida.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/54592337185.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116af5cebe31---57804149477.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc72a1be6c---78350391719.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4c752806---rudunoruperu.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_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 18184 bytes
SHA-256: f37cda2398aa9e496b01f4300000c93c63d3106fd16c1bbe1b6cf30365d39031
font_01_sfnt_off00010f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 10848 bytes
SHA-256: e849f7e0103783b0934493552f38b4c89a3f5998c16a644681309f86e8507589

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