Malicious PDF — malware analysis report

Static analysis result for SHA-256 25389dfab663717e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 15:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e7486eae77aa9c1f34dfd1006a30909 SHA-1: 3e93976f8fe72aa3159cb789b30f350ea4539c91 SHA-256: 25389dfab663717e6ca2a9c6b26d9edf4cae16944f2a961d8c1231b54a5853c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users through a malicious attachment to a site that further redirects them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/kujorekasaditijosed.pdf In PDF document text
    • https://kisikana.hr/userfiles/file/91333872951.pdfIn PDF document text
    • https://davaocarrental.com/images/file/mirepoger.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/fegokexifaxisebasazupemox.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69a3041a0---rasajipik.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/xitegadif.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/wilirugusagudifuri.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/zokuwagufubi.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/49485015960.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/lezunu.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/jokigukolokixuputif.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/90470619863.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/re47rja5bkkup3i7iric81met1/86258860510.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd77f7a514---lekajeduwiriduluwiji.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/hio838hb32gkv647dlj6200e11/37558769669.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/zidajemuluzejigumiw.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b9a5d6482---moxuwewamita.pdfIn PDF document text
    • http://nordavril.com/userfiles/file/raxodozi.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c5fbcf6a---welitefekodudizokitowebo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4973ce8a---88805106799.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a43000c0c---wimurezimafoz.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/vegazurijijekibedokorovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=2009+nissan+370z+manual+for+salePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 10972 bytes
SHA-256: e1fdd6fe78c293a83847b2418ef4000bebfcda34ff623d6ebc88347307ee04cb
font_02_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 17516 bytes
SHA-256: b8dad1b32d4e961a5b0b747c3be94e8347d3ac0a725df5de40084b2c781250d4

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