Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b53cbcaeaa23c9…

MALICIOUS

PDF

94.0 KB Created: 2021-09-01 20:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: daa8b560de3ef1732d6abe30643a0a47 SHA-1: b3a1f6ced6a080143c876ab7826f17941ef81758 SHA-256: 86b53cbcaeaa23c92f13bbb1221884990363015292767d55d370e4f2bc17ddd6
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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
  • 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 http://teechart.com/uploads/images/files/51312615712.pdf In PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/31116906369.pdfIn PDF document text
    • https://dm288.com/slicice/file/17498617643.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/96035406426.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/61ab170b439f18c19c607d22d22477f9/77949459876.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd6d80a54---699997614.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/38807402996.pdfIn PDF document text
    • http://prosquash.by/data/kewaxulewetulizan.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/618ae6c99642ad9dae600eea406e1a97/vidofepolekibemel.pdfIn PDF document text
    • http://usmleworkout.com/files/file/37875231501.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/57278856542.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc15045c2---36433991740.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ff937dc0757f09f8153c9342a8a4f5e3/wegufidixifakuleso.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/fajigabavep.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/molipujewezil.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/rinozexo.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/bidosixolepuz.pdfIn PDF document text
    • http://learningkey.org/userfiles/35089017031.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/jasoja.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/nulovelanoni.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/68376671534.pdfIn PDF document text
    • https://stotex.rs//files/81637302821.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/31566106361.pdfIn PDF document text
    • http://didopack.com/files/81102074563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=baby+store+names+ideaPDF 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_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 19212 bytes
SHA-256: 68b0f2641010a5c963e4be3d2cdaf0f9f0075ffe8b13dbb6b3b082a83e5ea541
font_01_sfnt_off00013a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A24 10668 bytes
SHA-256: fde3b733c438863abaafc2b95e42aee160595b71c5406afc4da102401365ac72
font_02_sfnt_off000152b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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