Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40d029de67728e1…

MALICIOUS

PDF

69.8 KB Created: 2021-09-12 08:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45555401974d3899d89670275d727adb SHA-1: ff957ee3ad6317c23c8ae25cd5dd66335e4a7b2a SHA-256: c40d029de67728e1a9eaadffc4a9dbaa9a68934b0cafeff3d981591b277c2fc9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6816

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://archism.ru/uplcv?utm_term=how+to+make+android+pen
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0d7213f69d017bba2c5cda2a790a885b/bopuwibozuvimevubi.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/29552804910.pdf
    • https://tivicom.vn/upload/files/kogetugexatumeperu.pdf
    • http://qiangka.com/ckfinder/userfiles/files/78882017310.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff70836d77---jefidorofavifewazag.pdf
    • http://a1-automotivegroup.com/upload/files/wibovopijivuwulabixejafa.pdf
    • http://hla.vn/upload/files/pigusevizikimepupakosu.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe1e36510---97687796821.pdf
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tarimowumunalox.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c344e14cb---votatokosowuwazu.pdf
    • http://www.hangmandigital.com/files/file/gojejedelababoram.pdf
    • https://legouic-peinture.fr/userfiles/file/85112703340.pdf
    • http://master-br.ru/img/file/15990044621.pdf
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/guminojunegilez.pdf
    • https://ego-sofa.tw/uploads/files/202109111418085527.pdf
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xifojaxi.pdf
    • http://runnersavezzano.it/public/userfiles/file/zosoxemobifasudu.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/35825460109.pdf
    • https://infosantiere.ro/userfiles/file/25477178126.pdf
    • http://sushimura1.com/uploads/files/75969015739.pdf
    • https://familienbilstrup.dk/userfiles/file/nelemumilorufusibu.pdf
    • 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_off0000ba5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5F 16792 bytes
font_01_sfnt_off0000d276.bin
343c0125e27be47c45116f37d4142d2d35bd14c009484b3ed69423f38947f8fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 10508 bytes
font_02_sfnt_off0000ea4b.bin
b39e87cd851a0759edf6574d58e57f0c07e90d9eeb2b6419192c66cbe19e80e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 20252 bytes

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