Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4e10c64b86491e…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 23:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c665008efbb5954cbb064ba03722e894 SHA-1: 6c96446d0eebfe317bbe93f57f1061ed929f24bc SHA-256: 9d4e10c64b86491e1bd0906cd8f7e55f7b779d7f89420048343e5d151b80b2bb
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 CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns that leverage these redirectors to deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/bd9c22f79a68c6bf073bcbae577829d9/65121081814.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54abdff80---56040926646.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f99c145bdd---68425256236.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/737c22cc3702264da75368e28cb4c134/fodetufanoradizaw.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/a6b4098d87cc542007ba4636f4233ab1/xuxolebe.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/rc4e1r36c6biikvgkj1klpdjt8/baxifo.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/91896232177.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/67411379711.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2skina1qfv1dli3kid0r5210d0/38993126024.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6v6l2eami84nl9m163eoh41rb0/gatipix.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ab2dc58c7---xuruxuzale.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/vozibopolid.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/77679927889.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/xotowo.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/82cdf8326b8d899b152506e4fccdfe81/dajujaziz.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/22547313670.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/mizepezaderesagibe.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e2a4f19e---96101711715.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/16099773401.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rqi70s4e4nje6okdrt0ekc290l/bikimod.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2ece2ce1---sovizutowudalalamexam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=manufacture+of+cement+pdfPDF 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_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 16852 bytes
SHA-256: 96276800fc74ae019b97a72308f9d7e9daa2c827788e6eb04f87e1cd7c0264f2
font_01_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 10568 bytes
SHA-256: d66f61d118ec46511fe7d1f409c6bdf985dbda4f282d25332c8ae23b78b0953f
font_02_sfnt_off00012f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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