Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c045d9ececdfe11…

MALICIOUS

PDF

65.2 KB Created: 2021-06-07 05:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab5241c14cb705630c27cbac3b0ad7d2 SHA-1: d5c9597c279bc2d109356936a9582ccb16bcbcfe SHA-256: 6c045d9ececdfe11bec86a6a0f0e7f83f27c21b2c4c0d704f86cf7b53c9836c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to direct users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7801

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=empire+and+allies+hack+android
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/b7c68fbe4bf4f8749bc5bbad5120190e/dexijevuxufesufowu.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081a962e4f79---nutotowedijaz.pdf
    • http://forter.vn/hinhanh/file/sinubusebaraxurufike.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fc5ced554---15141650476.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609406e8c0707---berixaduxefizexo.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/43cbc7c9de7a07277b7b4295901b2eef/88593736785.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/g349nta5qn5955v3sijjr557fe/sidajuxi.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/057a38e5af9fda35936462713372e7f0/vitugizamanovorepixawuj.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986612e5436---40937932951.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b3e12019e---tuvulon.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/1589d5ae88f2ce0c2f39c519f6bb2616/ritisotujabe.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0db55259---bixuxudozal.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/xapunulelejakagorelujuga.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff39404fa7---wekajoseledizanukup.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ae78c9e94---35185390329.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://irodori.kir.jp/files/file/xibobegozonubemozot.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9cb.bin
f042fccfab2b5a83c4a1c93c2ebbeb53942c410e21365555a7b494674c10ae7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 3316 bytes
font_01_sfnt_off0000e5a8.bin
47138598ff05fd001595ee4d29565f7fad86b7c19adadf360e876dc83a1a9b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 5336 bytes

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