Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fd7f414191fd71…

MALICIOUS

PDF

55.8 KB Created: 2021-06-25 06:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f586de5e535079a499fbe9c0e32a2ede SHA-1: 9791b77fe1b0c370a4ec4ff0a7bc27c9740dc99d SHA-256: 57fd7f414191fd71a7b473ac309ed6eaaf07692dc2a0d5333554b09a354d7b17
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8225

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 http://baikalspring.ru/ckfinder/userfiles/files/nakiteganutet.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1rsl9moqam5bfalf6o0rk2p2b5/46268346440.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/91447608029.pdfIn PDF document text
    • http://bwc.lt/i/87592123315.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa7080aac---zuxotipulebogaj.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a161c347d545c506bd75648f96324699/55348605635.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/lejigibe.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l5dabbgfgdfbdfr4o60vg1mn2n/26238692411.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f67eba666---59807239334.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/6f1bfc6a9237b61ebb3e8775c92054c8/xatiloxifutir.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/66818266853.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a58e1694e---wefesepizetinolelulo.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/76586865318.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=salafi+pdf+booksPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC541 5248 bytes
SHA-256: 5d0dbb144e395d1dae6607bd3f2b1eac451215d37ba10468bd69d8945ad019f9

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