Malicious PDF — malware analysis report

Static analysis result for SHA-256 44700c2e8bbdb842…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 21:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 484e973a974491452e99c026bec29752 SHA-1: e58453d0dd1b747fe02f9099cf9e645a67c808d1 SHA-256: 44700c2e8bbdb8425456e8bc2fb2742f66f349f2f1a4e165536e2584b0940b7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=prescott+harley+and+klein%27s+microbiology+9th+edition+pdf+free+download PDF link annotation
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc66d2adcc---63869133779.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109070953341502.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/xatosasoba.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202198205355420.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/tosopozewozelal.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/tipevekituro.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/85456639023.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/62604224688.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/zujumuzimegujo.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/324612819.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/u0nuccqc42ahcg5l7snm67qc5p/parilizikani.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/leten.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/72760227090.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/54904365487.pdfIn PDF document text
    • http://cobmedia.hu/include/nomukikatevamubilorixix.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/zujidepuf.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9igu6v3g660r1mg9kt4rnpo2ml/goxixapax.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149a4dee0b39---47514988866.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/89611563918.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/24302895943.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/85803318165.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/39178161053.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/poworewomapudebuwusuwowi.pdfIn PDF document text
    • http://skupka23.ru/upload/m/jevuga.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/56g0afehiqdstu1lt3qe9u26m3/vutidagokuredaf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC74 14844 bytes
SHA-256: 9192845d9ac4ff4d59f994e8125287b0e5257a0c669447fb30a435992f1afdd4
font_02_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 11700 bytes
SHA-256: 9cc6c6c588d39f1d3fcbc24c23d8ff6d9ec51c064a19789aba6ad1feb87c1d8a

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