Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c590f6593219fa…

MALICIOUS

PDF

76.6 KB Created: 2021-09-02 02:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 929a14e525f546fa2db01588434c59e0 SHA-1: 0c652ae706ea21e0f63db79b841146df24c00e4f SHA-256: 86c590f6593219fa511d2ecd14362d756e8f8b22d4fb51f7697abc33ed0b362c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=tingling+nose+menopause PDF link annotation
    • http://diamant-x.sk/UserFiles/file/83649851874.pdfIn PDF document text
    • https://immobilgold.com/file/37866238837.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5154284087.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf4cc6a21---niripuwewurexafoxeb.pdfIn PDF document text
    • http://4bx.pl/public/file/90266325218.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/dovisovu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/3b7802b4bafd32a05c7cd254298faf3b/22263931858.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/749807628.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/76803426327.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/79509393645.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/zapojisel.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a476a297658---37368901360.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/7nqrt27vaoub2vnlfurgbdbdke/77026828556.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d1fb4a651---fujunirisemuvi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ddca73d47---20406455978.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/pewuwop.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/bazelamebugelaweri.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/1640520892.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r8tvna52i9b4psm341ec220f75/linaloxutogudi.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/58339231236.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021073022073071.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964da329120---wasejesikugipowe.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210716095109.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/426ae6799bdb961a77d093007d2f0afd/67605140527.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_off0000c923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC923 16888 bytes
SHA-256: 34b07fb04e6c43d8080208adcd5ec74bd6747aa6841d82320950a5b5e57bcd07
font_01_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 10460 bytes
SHA-256: 59149ca2191db2e473b5f107a8d06cef7e25a2db92f5cc94a1b2b7efe033aeef
font_02_sfnt_off00010c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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