Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f67f2dfbb4e7c9…

MALICIOUS

PDF

95.8 KB Created: 2021-06-14 22:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd90828e7cad2e20f153faaefd3bef1e SHA-1: 1303904e267fcb907f6d0cab8f5d7260a89279cf SHA-256: 17f67f2dfbb4e7c9d603439e2de0c890ef14a8aedc26cb0001217b6622a31bcc
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9452

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://pixomot.ru/uplcv?utm_term=determine+the+symbiotic+relationship+worksheet+answers
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609831b27bc6b---lorulidunepawusozomekixo.pdf
    • https://atamergranit.com/userfiles/file/bateruviporalijugidokojor.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/70a8fac544ab42f787a0943bdfd115a4/tirabifag.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/xofatabenuzixudatopupag.pdf
    • https://isleo.com/i_photos/file/danujufodixowigezegejome.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1745d9b9352b721529648dcf694964c7/borenevefipe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcffaf23c54---19021342580.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f84e6486b---48816127664.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/64993996132.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070094219661---fozovofeno.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b6c4a990---65472423660.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2ea06c24fcafc4a9a0b9617b0f704f43/larenejudivojumagol.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881a7f61228---34215335209.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea06090ae---19784379608.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_off00016e6c.bin
3cbe7a387c7f569f3f4b321376ecf903b3b5c0b8ff55b1a6902bf64da6488f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E6C 5572 bytes

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