Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa418b76cd1b9429…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 12:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e512ec3b238fbe9315e447720889662d SHA-1: 2c5f58cd8abc9f8768ca4515e730aff9a9d8427f SHA-256: fa418b76cd1b9429b4d96a543ce7c194ddef459cb58bc560c9f9e48b8feafe85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=software+update+for+samsung+galaxy+grand+neo PDF link annotation
    • https://iieng.org/editor/ckfinder/userfiles/files/pebanuzitolaz.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bbdf4f8133be76d6a6ac2170d9111df8/72198984171.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/19951660667.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/83410544097.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/70582624647.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/26162916630.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/zawadiwugibugijejepo.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/3062229824.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/bejajegimugijirubadabepus.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614099b2858cb---jirus.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/79763517378.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/pimoxumegowo.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/zoxexusaxibuzeve.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e337a2d687d111000c0ba1c7b10f551d/20158058308.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/zojutoparekokunoxufovis.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/mipowosanamoxef.pdfIn PDF document text
    • http://kbchina.de/upload/zobogotufelusapij.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/993f45dd0f3df8feb7fb73bb60c620da/4731015451.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/wizofetisebo.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/73625805959.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/tifiledarexewutokogowapav.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/vupidakafuserumugixu.pdfIn PDF document text
    • http://vce34.ru/attachments/file/10041736225.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/zemoxoporimudujijawafo.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/jifuxiwakazer.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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 16740 bytes
SHA-256: d4ea389c01cd3371ba8ba944755bbf851c9cd2a41c53af4f156ace282f5821ef
font_01_sfnt_off0001027f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 11228 bytes
SHA-256: 1324e09cd6b8edd78fc27e5d06a13fea9e61bca3ad49e60e495ed0a845cdf3c1

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