Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5cd875b4a51507…

MALICIOUS

PDF

95.1 KB Created: 2021-08-09 22:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cd88be93add2da53c5d85885c32e9849 SHA-1: c9baa9d00060929f1b52405a7c04eea21a236295 SHA-256: 2a5cd875b4a515078ad80d0ec2070bd9882103f5aa049c3afe3cf292d9f95a5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. The embedded URLs point to various domains, some of which are hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=%D0%BB%D1%8D%D0%BF%D0%B1%D1%83%D0%BA+%D0%B7%D0%B8%D0%BC%D1%83%D1%8E%D1%89%D0%B8%D0%B5+%D0%BF%D1%82%D0%B8%D1%86%D1%8B+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE PDF link annotation
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210722_B0FDA8832DDE8E5D.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/xevipikategojivudiragejax.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/96612272651.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dfb3fjj0plv5ci80089t35i074/dizodasodutulotoxivifi.pdfIn PDF document text
    • https://sealskinz.ru/files/file/72921042490.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609449af525d1---refororezum.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6b19a910528011064351af0fb7c641fb/2240516762.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/18092afeee42a3b0f8ec685b128e4bf0/27740627429.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/68695010816.pdfIn PDF document text
    • http://kbchina.de/upload/pigolutizefokabezadib.pdfIn PDF document text
    • https://yellowstonewildlife.com/635425616.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef318d937---tagazobowurupewosaguwixol.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af23b508b99---43448695815.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/puou0r6opq3jvj9iok15okbm74/mevonadazezemuzi.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16097325c6f6b2---wafenofedifovojawemagegov.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/75440238287.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/dc46cl7gbrr51sqoa5e46ndt04/nepimogotelugegul.pdfIn PDF document text
    • https://kawanmto.com/contents//files/20905568247.pdfIn PDF document text
    • http://schokozentrale.de/idata/pitib.pdfIn PDF document text
    • http://www.asslar.de/downloads/regotokokagitavewonejeses.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b0623593---jotesevik.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16107879d57a47---23801318595.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/11064696488.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
    • https://www.youtube.com/channel/UCnWC43C8sTTyjsRH2jacYgA/videosIn 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_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 11464 bytes
SHA-256: 19ebdf87f633b6b64a972595de419be3ee1a49b17e135e0772317581c881ef2c
font_01_sfnt_off00011d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001353d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353D 21540 bytes
SHA-256: fd3ab38cb322c48e439b24c9696ec868ed228a8ec3add420cbeef5dc96db629c