Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad5a71936561f0c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 00:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f4e9303dd52e922d095968a4739859e SHA-1: 7049e7ffabda87abb0ec1176883a34bfa4a30502 SHA-256: bad5a71936561f0c6e54f46710ce502caccfa4f9fb47c99e01e1d4b7b79f539d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially compromised hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bhalakusari.com/uploaded/ckeditors/files/57228365335.pdf In PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd505b858---bulisepogepefemusasox.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6r7t6viqlgokc8jj15qcpabe16/jibasapakoronuzumazarava.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/33663490475.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/86659825544.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/sawezadipapufelijate.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210511151257.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/fafiwojimemurukom.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/40545042675.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa6c53954---kefoparewodomenelaguni.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/efc018f9f12742e5f42bb49de164a2a8/80326108892.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/71986941695.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/37064348661.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/20825638889.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/bf470202431473bf9a56b0c4b79101d4/wanidod.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/93fd4076158703acd000769a20a1dc6e/90908276943.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/3806507479.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/jarod.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/nexusonuwer.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/3bea806d2685012351554b26f9e1dca0/jubikizuzibirizanak.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a5e3ed54f90d102f90df5610a3e126af/69070542481.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/kikijudarimemuvugotugun.pdfIn PDF document text
    • https://campermagazine.tv/public/file/viselaxavuruxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=quantitative+skills+1+pdfPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/47335513032.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_off0000da9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 16696 bytes
SHA-256: 378de40b4d66313848161f21c5287be95be8630620cf9723c04086de52cc9d0f
font_01_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 10640 bytes
SHA-256: 7249730d198c5639801e9fbfb2468b60a001bb74ac3c95e28f4499f5c30b1b1a
font_02_sfnt_off00011e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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