Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b6bf85c2004ed0…

MALICIOUS

PDF

85.7 KB Created: 2021-06-29 17:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 943cdcb6da00143e964187b9c82abe18 SHA-1: c4010f1bc62ff38fe0c048cab0ded4065934153c SHA-256: a3b6bf85c2004ed081c0caeaa786717850627b83d267fe520a8e4b081196ab39
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it employs a social engineering lure to trick users into installing a browser extension or update. While no scripts were directly extracted, the presence of numerous links to PDF files hosted on compromised or disposable domains suggests a multi-stage attack designed to deliver a payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jikaramen.com/uploads/files/79258772753.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/olpu6m9brj2qupfijasn1isbr2/34237268683.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70071c66f---degedexilimuvatupodota.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16207061636732.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073194429cb4---duxabakepisodebefadux.pdf
    • http://dbhsreunion.com/clients/21010/File/zikosakonux.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/43137483070.pdf
    • http://agendaalzheimer.org/files/galeria/files/bonufezudojaliveziri.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/46404838272.pdf
    • https://eyetracking.pl/userfiles/file/5213628845.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c3bdd7fca---givonijulajometuvov.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d8c756de9---3810525077.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607af43bbbdb9---mapujamosefi.pdf
    • http://yokohama-model.com/userfiles/files/fitejo.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c033de07f---2096046982.pdf
    • http://apexnepaltravel.com/userfiles/file/49000778330.pdf
    • http://www.lnk-creation.fr/upload/file/rubagofurovowi.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5e713e9e8f796ddba7e9a324e9c6fcbd/gatekagiselusozugojowife.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d74d87a8---39695236223.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aec1457ba---22651265650.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/hoa34ikcpra8kef0mcgmq2ptqv/37855050216.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6df4654cdf---bawijiralax.pdf
    • http://aryajob.com/user_upload/file/25913035009.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=real+gangster+2+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb30.bin
2a634bcc439be956120e774b8f979098f356cf96c904772ac277d27f13f23be7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 17208 bytes
font_01_sfnt_off000117de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 16792 bytes
font_02_sfnt_off00012ff5.bin
d545e4b6a22c80cb502448b8fa0705e3653f577c635ad4c978b35b12e48d2358
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF5 10580 bytes