Malicious PDF — malware analysis report

Static analysis result for SHA-256 942d8c8f3f5b3883…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 08:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af81ddb0d90c67d565cdbf522b1b6e83 SHA-1: 45af2d82b157a80b668fa70ecf7dfd2f9b51523f SHA-256: 942d8c8f3f5b3883863afb6ccd6003e1eca72e89de478682e1b4522254db5655
204 Risk Score

Malware Insights

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

The PDF document exhibits multiple high-risk heuristics, including ML classification and ClamAV detection as a phishing trojan. It contains a 'Browser extension / update installation lure' and a 'download button' heuristic, indicating a social engineering attempt to trick the user. The document also hosts a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a distribution mechanism for malicious content. While no scripts were directly extracted, the nature of the lures and the presence of numerous unknown URLs suggest the PDF is designed to lead the user to download and execute a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://strefaokazji.pl/uploaded/file/93214297838.pdf In PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/lijalevawipikafidejukizaz.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/luzogifawedugufewoj.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1846f50cddfe848390a8bdb3b3aca34b/lofixemis.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/20645784773.pdfIn PDF document text
    • http://irths.com/upload_files/files/34140058960.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613025b074c2c---93781350994.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/sonoxogopip.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613602412d473---pubebasulofiva.pdfIn PDF document text
    • http://ausafe.net/images/art/files/1700648260.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447d39a98f8---93587871547.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/rorojolebifokenebuge.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/bcc4adeff193e68eed4479bf435b5ea4/3520415671.pdfIn PDF document text
    • http://ccshecea.org/upload/files/61178650669.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/155506994661449d4ac960c.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613449612141a---taxizezofupude.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/xegilebebijim.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/60989761139.pdfIn PDF document text
    • http://tdbm.vn/upload/files/digupoxikasowafelomara.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613782903ac94---373393375.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4ad5247fc557f4f50d6624051bdd461f/5707345963.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35623b11f---93155323434.pdfIn PDF document text
    • http://bdsductri.com/upload/files/lujumalutopesokixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=can+i+root+my+phone+without+losing+dataPDF 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_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 17020 bytes
SHA-256: d5cfb03ac7130acec2acdcb8caa8b917cff81f81c95083339f9fb8bf29e804e2
font_02_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 11172 bytes
SHA-256: cfe455929985aedfbb16e87e402ffaa8e4d7adbde4cf1b85929e64f8eef6b56e

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