Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db07cd13079675a…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 15:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e63db850fd21d2e183a503b85a3675e6 SHA-1: 55366136791d9adb871ccbbe947ec01b3838f194 SHA-256: 9db07cd13079675a3b75096d9ea66bbf41b3efbbf1c5c7d3e3883263c7441560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=elemental+geosystems+9th+edition+pdf
    • http://garmaclima.com/uploads/ckfinder/files/34188506990.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ab294f373---lavurewi.pdf
    • http://quiltingacademy.net/fckeditor/userfiles/file/tukabonorudodojelujadi.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ad8326d1---rafodolup.pdf
    • http://penzion-u-zamku.cz/files/file/dopivexuzoxof.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fddee772a5---wazorujom.pdf
    • http://vizit-k.net/uploads/editor/files/waginoro.pdf
    • http://www.offshoreyachts.net/web_upload/editor/files/niludime.pdf
    • https://stealthwindow.tw/uploads/files/202109051423155370.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/28465134859.pdf
    • http://chayka-svg.ru/files/44184390425.pdf
    • http://vonschickenfremont.com/uploads/files/48716316318.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a103b9c7f9672b514bb0a0eef14452b0/setufeberimofema.pdf
    • http://dkkarsin.pl/img/upload/files/bobinoruvilepexaxo.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/19839895299.pdf
    • https://moveo-sport.pl/userfiles/file/57799969476.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614279556a212---36711294964.pdf
    • http://tcsklife.com/filespath/files/20210906185606.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/zokebiko.pdf
    • http://learnersdigest.org/userfiles/file/gabenovukigupinotel.pdf
    • https://tktravelkorea.com/FileData/ckfinder/files/20210906_4CFE550F031D0685.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad55.bin
7c50ffabd4a05493baa4bf34759ef26120d5d6e0df887aa1318843ed1dad1547		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD55 14808 bytes
font_01_sfnt_off0000d26f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD26F 16792 bytes
font_02_sfnt_off0000ea86.bin
9b4d0ebe0b71028bc32bed75ee74b944bee6cef543476d8d3568eb2414d99df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 11108 bytes

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