Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05276d7814d3d57…

MALICIOUS

PDF

85.9 KB Created: 2021-06-17 10:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1e4f9130c9743d8b57c9e4ec220ea957 SHA-1: 786139890b36c3a5bcb996971d9ef4c365c9cca1 SHA-256: c05276d7814d3d57b755894b305a2beea3856465afa4bdc18b8cdfb039bc8245
174 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9619

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=fast+and+furious+8+full+movie+720p PDF link annotation
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4685337d---98681598904.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607528d42837c---gamunatizepafeleduv.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608601c713d38---60605467627.pdfPDF link annotation
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608854de2e535---20762723964.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/52556938355.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0472b4841---60359318478.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ca62474c---rowubalipivupolamidimap.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/62647732233.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5403249c---14384506687.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/xukafoviwidutomawovowif.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/gurugowa.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/dg94u6d838m003to9upgsj6i56/46805945744.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/16784e3181699249e94fdafc38ac9e37/64703113875.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/63cvt3rg7evloieud0t0vl1421/71483880914.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/44593408060.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aed38debb---77165923693.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed75603e8b---gasozamolegoleduwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 5748 bytes
SHA-256: fd7a15218eada276cea905f3320b72779d6633c8758a1f7503aa8d6b343146c6

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