Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41dddae00fe8269…

MALICIOUS

PDF

95.5 KB Created: 2021-07-01 19:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c676384099b80cd4b886c087970eb14b SHA-1: 9e0e8fa595ad2e3a78f29e3d180702906ebcc9d8 SHA-256: b41dddae00fe8269d7d55a1cf47c5e18e5202ec277995dbd92a8fab34f3e2e75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://catamma.ru/uplcv?utm_term=use+insecure+in+a+sentence PDF link annotation
    • https://saksisan.com/upload/ckfinder/files/gisarexujot.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/4abb9b775d767d180381d15ea6b8994f/36938342744.pdfIn PDF document text
    • http://euro-ex.com/77462048867.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/47459456302.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/gepotapukogudakofo.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1b29c0ae3596fa2fde6219951b531dea/28109635268.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ut9g5of6iqa98flrs37v4v2t22/tufifaxarosevinolawef.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/6068088124.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091fcf512b16---71899242993.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/93812325518.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/45759461869.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/39223042507.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d637317de9---2153107224.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838c22edde---562701737.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7a98c720c7b37b77f5a2f86deeb941bc/79797963951.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608123a7a4d87---zutifinudoxupu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cca087e28---96223989260.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/gizisumefomakitabopijekex.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6c6d30bfa3d191676efbf6c23e9d7ad2/4294975262.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/82026460487.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/17799999100.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_off0001148c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA3 10164 bytes
SHA-256: c11c3cb69043be86f66acc7c5767e8516c6a1bb87e82fe3641b8da4e30541f99
font_02_sfnt_off00014385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14385 17416 bytes
SHA-256: a78b36433706532a18b48173e7c43274d72641ceb557c88aefe1fd2744b97bf1

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