Malicious PDF — malware analysis report

Static analysis result for SHA-256 5608940dc63cf652…

MALICIOUS

PDF

49.7 KB Created: 2021-10-03 14:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faba6b1f9d333d8f828309f0a0f8ed81 SHA-1: 8159f61319db6d088a9919ce5e9ca501614f4b85 SHA-256: 5608940dc63cf652baa798bc4a35a1f59c37e632c8b335127237ebf4dfca001b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via link farms. The embedded JavaScript may be used to further obfuscate the malicious links or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8355

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://krisoc.ru/uplcv?utm_term=five+nights+at+freddy%27s+5+free
    • http://macabrey-luthier.fr/data/Files/12113200606.pdf
    • http://angelofthewinds.net/ckfinder/userfiles/files/tufokawalazafelexow.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/38853801947.pdf
    • http://tsg-edinstvo.ru/userfiles/file/detaselid.pdf
    • http://stin-verdon.fr/assets/Image/files/vixova.pdf
    • http://nguyenphat.com/public/default/ckeditor/files/88049003490.pdf
    • https://duragloss.pl/userfiles/file/kapowata.pdf
    • http://oroblupiscine.it/userfiles/files/3530617401.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161526c06bf251---nojibenobimumejajuwogex.pdf
    • https://tnmkor.com/FileData/ckfinder/files/20211003_1E21B8874B7DD5E8.pdf
    • http://naitikfashions.com/ckfinder/userfiles/files/kozepo.pdf
    • http://devison-matras.ru/upload/file/wukuno.pdf
    • https://artesapanaderia.xyz/aym_image/files/84168555654.pdf
    • http://baovekhucongnghiep.com/upload/files/fisutexabibibano.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/127b2ae941537f58f13ff312a150e876/nuzizewasajaveru.pdf
    • http://www.39koratmachinery.com/file_upload/files/81945124958.pdf
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/12833582034.pdf
    • http://viettruss.com/upload/file/kisaxowakitafapobeled.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/13000568138.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16143a5e8b5e17---jasetagajevimojoloze.pdf
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/towuse.pdf
    • http://vietlinktour.com/userfiles/file/32851632097.pdf
    • http://cdkuys.handysociality.com/upload/files/wuxagutiv.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b26d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB26D 16792 bytes

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