Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23f3dad9fd170dd…

MALICIOUS

PDF

69.2 KB Created: 2021-06-05 23:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc5b437c5b4750b226940c2d8d47dd91 SHA-1: 350caa4978c04d8c67cce9a64e1eb3c748dd591c SHA-256: d23f3dad9fd170dd1ac746f808bd96e5a0a6b7d1065cec5800fae502aea5c3a0
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded links and the nature of the heuristic firings indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7986

Heuristics 4

  • 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.
  • 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://chcial.ru/uplcv?utm_term=basketball+dribbling+drills+with+cones+pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2a4da400---wisosomajulafejotavev.pdf
    • http://beepost.vn/upload/userfiles/files/85446286895.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503035531206608.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160749a77662aa---13182669853.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7737d12f5f---murogosinexuvurorenoj.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ch3q042vgv79vrcskq0cjttun3/29687863029.pdf
    • http://www.heksan.com.pl/file/8295556663.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/eb33210989683c2cb028974dc824b202/36711485020.pdf
    • http://ipceurope.eu/assets/file/34919959709.pdf
    • http://agrobud.net/uploaded/file/53729751506.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/fb269d14a2f62f5817c16ce19560e1db/wojofafekukevilerere.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4845c6b92---dukipozomorudixe.pdf
    • https://alshamiltrading.com/alshamilfiles/file/womadavemov.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f059caa3b3---32962868082.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90b.bin
afc5bbdb064aaae304b9642e5fdb75caa1cf27b5bda11e65297a167ace8dd7ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 5760 bytes

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