Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c268445b360a5ee…

MALICIOUS

PDF

66.4 KB Created: 2021-09-09 06:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d300954ebe85e9f7e1bbc8b2d2b4a7c3 SHA-1: eb571ff0a294154f19fbbc5f6aac85a9c613bcef SHA-256: 6c268445b360a5eeb005e29f93a6b5c14788dcb19139a814972d7a2175b43a72
162 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and multiple external URIs, many of which point to link farms on disposable or compromised hosting. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript likely facilitates the execution of malicious code or the redirection to further malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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.
  • 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://medvor.ru/uplcv?utm_term=you+tv+player+for+iphone PDF link annotation
    • http://ibb-online.ru/f/file/81690595835.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/31732147997.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/jolarizajuwigek.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/487770577.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/pafiduxivumuvewuzejam.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/12063799373.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/26691997751.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad9e78d70---36579649597.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/17719402774.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/redufojimi.pdfIn PDF document text
    • https://melz-feu.ru/upload/43850339772.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8b9f25f5---pidiferurorofemubetepo.pdfIn PDF document text
    • https://resicolor.com/upload/files/95927924236.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/navepoxu.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/22586023191.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/ripakaru.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/dugizagabuguvera.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/725ef7b3fd6262bbd0bd42d4c1556337/56395906579.pdfIn PDF document text
    • https://buka.ru/sadm_files/1615897613.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/29015747627.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/20522030129.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161357e83ac328---88590757092.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/togesagitokufenidenenuwup.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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