Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb11bdb17997e662…

MALICIOUS

PDF

47.5 KB Created: 2021-06-14 02:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c67a014da2258935fdcf4b035d4e43fc SHA-1: 541c54d49ef176c2813b74253acd01c64fdb472e SHA-256: cb11bdb17997e662ec64504f708847e7a478b779567c984e884cbd5fbd65ee3d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'flash bootable ubuntu' and 'wkhtmltopdf', likely intended to trick users into downloading malicious content from the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7205

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://inwebjor.ru/uplcv?utm_term=flash+bootable+ubuntu PDF link annotation
    • http://zhengfutz.com/v15/Upload/file/20215211626105584.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d6d99ed29---9929009048.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b9b9962d408c7877f700cc743572563f/zidobizajazu.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c4d4f5e39012c02bd2460303c87d9c2e/bevuzofifid.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/jilosiwejozugaxeko.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/25541332809.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/89369572506.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dda39d1790---69884174894.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4879e6cafef510e3653d8a845c4be449/pometojalex.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2922fc57a5---32519634685.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8df8ca764---53640399782.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40ae08bd00---gekumetubuwenego.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effd0821be---jikaf.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5483383d01---mesisosezidimetopumojode.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/dabixe.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4f47816b27267bdbbe773bf3dfd79e85/76571371510.pdfIn PDF document text

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