Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa5a7be9a9db4e8…

MALICIOUS

PDF

87.1 KB Created: 2021-08-02 00:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bacc64baf4629976d632183b596e775b SHA-1: 65e412d396e4e18c58bc825eb52ca37fb89042ee SHA-256: afa5a7be9a9db4e88b3eb6a8c57a796104c84833ea29fbd00421fef776debdb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://cesnek-vysocina.cz/UserFiles/File/nutazamarobibekaseb.pdf In PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/65625461773.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/37999088890.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1992dc276bfd7f2fff1c876fb5921e31/kumani.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd67962a4a---46257042809.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/91426289072.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nuxumikijuwiz.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/c8f8029cf3de233bf99f837120ab9c02/susewamizum.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/buhp2s1h9v3u2vksq97gis2h6o/43536735817.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/47493847294.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/lolenijobemokofaveb.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/55100639091.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/xipesivel.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9a58139a5---pipixosijutumoza.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/e8b4d246f779af8b5c8fa2bd99ca5e76/57946042783.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4744374fc---serokobenizevobu.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/98553566609.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ce6mnq5bae5fd25anngg0k1mqe/7924559223.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5800304e17---80313015327.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65f0d2a69---39461984722.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/wuxowijafinekepake.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/weteduperamovulup.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2a6fb07a82a4a0582f7a65cf86583f4a/guzaxofedatog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gear+manager+for+any+device+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 1800 bytes
SHA-256: 18bb9c2cd670c1a9e241358a480b9680328cc824ed3dfb795342fcb598bd8874
font_01_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 10964 bytes
SHA-256: f1cb86e7be897a244380b4adb382a374308c082e62d2f054f5a7961a03fdc0cd
font_03_sfnt_off00011f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 17928 bytes
SHA-256: 7905a68451cc7eb75f4cae145fdee3e7c40c9c5b56999641bfa8a08eea7258ad

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