Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffd0606e6b2d9b1…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 10:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f67f151b900d60f1c1029cf50923c87a SHA-1: 934212542b1c7c79c9f5f33fd1b36c3a22a100a8 SHA-256: 8ffd0606e6b2d9b1ffcf491d5de1df4adde3d9513cc75804e91d5262a1b9b16f
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to host malicious payloads. The presence of a 'download button' heuristic further supports a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=haake+viscotester+manual PDF link annotation
    • http://tuzvedo.hu/elemek/file/kuvudifegirirojeg.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/xojelojuniwosudalanudam.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qm3qdlpv8p0l7uauqpmpvn5knc/91974508344.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16109a23108386---45666480233.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b917e345181---66056194223.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d331a958b55a27c3738a917bb68a73dc/49166065541.pdfIn PDF document text
    • http://atek-ent.com/upload/file/sirodinewo.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/puwavopa.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/26818571868.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/13348572826.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/livitevuvetofemak.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/73541561572.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/zanenonibomarizaxata.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/polawaden.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/kunuxisefage.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/xajimekorelezemodale.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e48dc715a---gopopunewobe.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/52691996730.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/36736746146.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/sexefajikokitosukefaxo.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///1763193015.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/fasukireponimajexomalulip.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/gexejudakadaxipibovosok.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_off0000c6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A0 10640 bytes
SHA-256: f2b2e4e4504c9ab8c96baf7e9a78823e86a84136f6d30b2587982f7c8dcaa846
font_01_sfnt_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 18592 bytes
SHA-256: 997789b7a52961e901bec8f5b476de2520f6e0d23b8ca46a87c8bad4214e6d8d
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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