Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bf6b80f1f46a43…

MALICIOUS

PDF

87.7 KB Created: 2021-07-22 17:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8fd1e15916715e6b23e00fcfa5a3fa30 SHA-1: 8293a5c173ed7cd13554bb4af7077190b5eab76f SHA-256: c4bf6b80f1f46a433b8d92581a8f6e7fcc1bd497721c7f7477528dbce861818c
196 Risk Score

Malware Insights

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

This PDF document employs a social-engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to facilitate credential theft or malware installation. The ML classifier and ClamAV detection strongly indicate malicious intent, and the embedded URLs suggest a link farm designed to redirect users to potentially compromised sites. No scripts were extracted from this sample, but the overall pattern points to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ef58ab85fc1edcd957c965e4f29b3549/45568029538.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b42df8af6d0---fikuwozugovegonani.pdfIn PDF document text
    • http://sukhabalka.com/files/file/lujetarereze.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/g07mipet09pej8ifus45n59oso/retisixozadidotab.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/sinonodol.pdfIn PDF document text
    • http://slsnn.ru/content/file/lenakenawaveg.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/693609521c8923ee756d84483ebfb279/82235470010.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077507e29251---15718890992.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/pipenoxepigokimewivati.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/18765229908.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a8e2b797e---77789317064.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/vjdbb8k89qr1o8is8qq5dde6ph/49593414646.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/51062257010.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/zeketabumixazuvimuse.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/bisesamewitiv.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/38407453954.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/wowaxeribesoponepake.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/23396521913.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e2f30274b2608ae31429eb29463d73e4/rifowuratutawovim.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jakopuwopo.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/48180891258.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160824b04af49b---wakozepudu.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/3196377613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=came+to+believe+free+downloadPDF link annotation
    • 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_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 10668 bytes
SHA-256: df03573a2104e0530af9528e53bbc6087a125da6b576257bb1c262a6e0c86c58
font_01_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 17416 bytes
SHA-256: 2b681c5de5efc90d550252f107b1406dbb6124fc23ab17dca182b230a0bd8915

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