Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b7c80edd70f238…

MALICIOUS

PDF

85.3 KB Created: 2021-08-24 23:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cd8d0d5037cd9aa61fe8a06ce47b7fe1 SHA-1: 9b284ea6e2cd30c19bcc08860b75684c80efa35c SHA-256: 18b7c80edd70f238416acc95df5344283bde86b99fe15e3e3900df3b66c7b046
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and contains embedded JavaScript, indicating potential for malicious code execution. It also functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains, which is a common tactic for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or perform actions beyond simple document display.

Machine Learning

  • Nyx PDF Classifier clean score 0.1153

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://synerhu.ru/uplcv?utm_term=the+base+of+a+right+pyramid+is+a+square PDF link annotation
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/025efc0230b9c23c1374f29ec589b8d7/76884193590.pdfIn PDF document text
    • http://livestocktool.com/d/files/82572848558.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611cac911e7ff---gisuzavip.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1623323955.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/62805337921.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/defimotagijuxiwusemo.pdfIn PDF document text
    • http://na3.it/misc/file/lopirofibofezulurab.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/suruxuridiruxedov.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/031452ad7be04a3fa2db7764a3539004/rinukovuluxulep.pdfIn PDF document text
    • https://bloomeng.com/uploads/12255713547.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/96259908376.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/39586186161.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/34984306106.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/43365668995.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210608_11A8073818C3ECAD.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/65706430196.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/lcceiltm3hf6idrdqqk3299qg6/62354999994.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210820160100.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/mefokixugajeverutexafaso.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/34944925613.pdfIn PDF document text
    • http://gabortech.com/admin/file/37838387839.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27e1df9f9---wisalemefupakitizuj.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/jumokajaxoxuma.pdfIn 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_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 11260 bytes
SHA-256: b095dd5565c7e0abef356f9059e4a805c7bab7f895126662b0ee8b5a9ca125f6
font_02_sfnt_off000120de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DE 17728 bytes
SHA-256: a5a734fbea9c3ea4fa2b780e2c55160c18dfb62dfd27212d240d58b298304135

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