Malicious PDF — malware analysis report

Static analysis result for SHA-256 5797858a2638b31a…

MALICIOUS

PDF

62.5 KB Created: 2021-06-05 16:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3208dc22adc4887115661f03faf1ce2c SHA-1: 3578bdaed10ab0c596d81729c160a5e7b11b431c SHA-256: 5797858a2638b31a7aff2cc65d1f6bac34e187ec0e8b974dc23cab65141aa7d1
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm used for distributing malicious content or phishing. The document body, though heavily obfuscated, contains references to 'Bgs grading costs' and 'wkhtmltopdf', hinting at a lure for users interested in cost calculations, likely to redirect them to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8027

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=bgs+grading+costs
    • https://angelsstaff.com/uploads/file/pekizufigujepojemate.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a43954ca4d8---19135773850.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160aae24351622---62441347098.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45524cffc---kilulisov.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/wowolavokem.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/cdmalimohbmd23t4k62btnqqs6/rinetegetakotu.pdf
    • http://gramercygrand.ru/files/file/xidosuzajujap.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16092096209c41---kuwurelu.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/caea01d40461a7b6a5e81fc63b2ad750/vifipiganofikijobifamari.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b94b263b---jogebelexubenixora.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8a9b3e99---debuvu.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3b72fb0f8b745df7d32d394c66856f2d/nimulagijozonex.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25d3610443---getiteni.pdf
    • http://omonetach.pl/foto/ilustracje/file/56048472894.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/15b4a989bfd4823049e677c24c221cb3/sagezatibokedofomepo.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_off0000d92e.bin
f905f1b2c540d365c9402e6d98b8426f87704dc855b90db04321d86be987efed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 5124 bytes

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