Malicious PDF — malware analysis report

Static analysis result for SHA-256 308b98494b623b96…

MALICIOUS

PDF

79.3 KB Created: 2021-06-27 23:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b004378bc50b690caeed01f127f30084 SHA-1: 9b0236b725938c185fe5f8d283618de9c46287ed SHA-256: 308b98494b623b960989c0e17a8b41b99f0d270775cf3a249ba4b46cb3e3aec3
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting users through these links. No scripts were extracted, but the structure and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bpabv.nl/uploadfiles/file/wowiwigedose.pdf
    • http://gramercy-grand.ru/files/file/38484131356.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/pmj92r8umup8gcv25pnatg9v5u/85637233656.pdf
    • http://faradbox.pl/files/file/1826916207.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca72c0910f---zavapezevonejitawesibe.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/6cafad2585c6a7998bc756ae95a5451e/61325515568.pdf
    • http://zigzagontwerp.nl/sites/default/files/file/kejovidirowuwugujesefem.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b125b5cf4ab---katigugufubelubo.pdf
    • https://flardochform.se/userfiles/file/77595441918.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/jakmvjbk5uluvp7j67thjcvce7/10272309464.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/71ccdb933f43cc41a49a9edec09b8641/rizukiw.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c2e07a50---91584267262.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c9001b0951b658ec0135052573371fb9/8463983052.pdf
    • http://xahscw.com/userfiles/file/fopemididev.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/a9918d0f430a7a84c20859583660f5bf/27381305952.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/dca6f4878ce141eff5c1588dec80bfa3/ratexapamexemujedatotimoz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d8dede76e---58684394267.pdf
    • http://rapet.hu/files/27282094905.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=grabovoi+weight+loss
    • 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_off0000d6e4.bin
11301cad074e11052f31e876e99b78e673e2c83747d0bfc393a5a49434a76552		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 10616 bytes
font_01_sfnt_off0000ef63.bin
3cad9521d90cf5a5de3e0b9c1749026bda38d5e511cd069b1167a052833e1edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 15956 bytes
font_02_sfnt_off00011876.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 16792 bytes

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