Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de5a337db91a2ea…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 05:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ca3bfd4d89d451b686554d338db1743 SHA-1: 894dbfe5a5cc3ca205de9982580380bfd3e56b1a SHA-256: 3de5a337db91a2ea4561e3e4453549bdec1e9366f8c76fa0eb5482c112cfeb1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links to compromised websites and utilizes a deceptive download button lure, suggesting it is designed to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an exploitation attempt, likely via a vulnerability or social engineering, to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=primer+of+diagnostic+imaging+edition+pdf PDF link annotation
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b07f75727d3---towukurerurabilepexo.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/69159996647.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e20ae85395---vukojukezoza.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/94135056337.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/likifufatepuref.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/3136731908.pdfIn PDF document text
    • http://apvn.info/userfiles/file/fedujifewinaze.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/25751914929.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cdda2f3e6---tafuwerojarajexifapexu.pdfIn PDF document text
    • https://papiratisk.cz/soubory/55405236327.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f68e06d562---64719268042.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67059f552---91543865354.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/binilojura.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/oba9cn23h33essoh3egrsjeqk0/koninezunaguziduwal.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210714_362821F179CD7379.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/51203853050.pdfIn PDF document text
    • https://akvaguru.hu/user/file/godewoku.pdfIn PDF document text
    • https://kaparatt.com/images/File/vimelapemegela.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/31357186408.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f739a9d935---nebejegelaperereveberumo.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/dubazakatedumofilobenatix.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_off0000c92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 17712 bytes
SHA-256: c150725aea8f420ee70ecd60e4a4d98fd373c76b60a4534b086c9e11f51130c8
font_02_sfnt_off00010f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 10916 bytes
SHA-256: 2d00f09f16dba3b2f8927d32ddc7db04cba62135b88389e43ad8e5671af96e73

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