Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c508e9e331bbd5b…

MALICIOUS

PDF

59.9 KB Created: 2021-09-27 14:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec6bc70fc994cde1878e3ef8b33732b9 SHA-1: e1449b71ae35e43bbd7788ffcc9ff01ad5a999fb SHA-256: 1c508e9e331bbd5ba09dd1844e8ec7ad5fd0d56f9dd2ad6a7627bf2d77620952
162 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

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://queure.ru/uplcv?utm_term=watch+fear+the+walking+dead+season+4
    • https://f2h63c2.ip4secure.net/upload/files/64898929725.pdf
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/53967038719.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144fcd49bb8c---74946729890.pdf
    • http://gestaocipa.com/public_html/Imagens/file/kasenezunu.pdf
    • https://am-system.eu/ckfinder/userfiles/files/35344466507.pdf
    • https://sanruouvang.net/images/uploaded/file/62067302004.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/254nb634fig4qtsuuima8e4ec6/70626088178.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142982d7437f---48363182110.pdf
    • http://kqcme.yiaiwang.com.cn/upload/files/20689884850.pdf
    • http://tydafa.com/dafa/uploadfiles/20210914094521.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/omvrf6jdo3g4v9as4lob8tnde6/zedivonekowemililevivaxi.pdf
    • https://1tlstar.com/storage/uploads/files/judomaxazamivanekizuvi.pdf
    • https://codefon.hu/js/ckfinder/userfiles/files/89089798689.pdf
    • http://psn-monolit.ru/img_file/files/josurevekopisiro.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/83610572726.pdf
    • https://sandipkumardutta.com/ckfinder/userfiles/files/19834765040.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136baaa73b9b---84160100594.pdf
    • https://morethancars.eu/uploads/edytor/file/fajow.pdf
    • https://netkat.in/ckfinder/userfiles/files/tesafobulufoxaxebis.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa9219da24---951620385.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9d47c33fa944c0eb5e2795a094513fea/zuzaxupuno.pdf
    • http://lyzjkgm.com/d/files/15303200033.pdf
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44671600556.pdf
    • https://excellencetogether.com/img/files/file/50078998910.pdf
    • http://eluvial.com/sites/all/sites/eluvial.com/files/11985050448.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b198.bin
dac482ff3bb5517683288de7102f1f752272f21591d46577f74654a86ded28db
pdf-font-stream PDF embedded font (sfnt) at offset 0xB198 14480 bytes
font_01_sfnt_off0000d5c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 16792 bytes