Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1bc252fc3b667f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 02:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c9c9616eee7b207b0a4cc1582359c41 SHA-1: f0265484728f73ef47147104bce6d395cb9f1786 SHA-256: 6e1bc252fc3b667ffca1aee0252c52da2ff744c883600ac5442f700818ad986a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://zabbeleecooking.com/ckfinder/userfiles/files/fusafewejij.pdf In PDF document text
    • http://fatamorgana.fr/uploads/assets/file/26257172407.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/52036067110.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/54896675636.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/jadiberezusikurovifu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16147b8be3e850---1002813395.pdfIn PDF document text
    • https://synersys.fr/contenu/file/7271618825.pdfIn PDF document text
    • https://bevillelecomte.com/ckfinder/userfiles/files/8503819552.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/091889b940fe13e413194dd0f16f4af5/37174949767.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd735453f---9466753152.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/kabalusoxapisogoxufolat.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/25905156719.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/zuzevirigixokibosib.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d50aeeed---pufukowezudilixubolorixib.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/51270363734.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/mlbq2gq4p18norisp0d83nbepa/98223485450.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/84583363943.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/tevederexogi.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/69560193896.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/vosozodesiwo.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-16/20210916215036180507.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba60d7e622---36740688772.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631897316.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/pujosowegekobubev.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/78859423731.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jqn3ti9u8pb8aq8bd2pohatou0/somovojejivawoxinula.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210901111306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+media+has+stoppedPDF 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_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 10592 bytes
SHA-256: dfe39f0b5c318c9f510cb4602e9e7dced41429b6696d0540a47750c4a768ffea
font_02_sfnt_off000114fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FA 18556 bytes
SHA-256: d7a2a0478a3542a07541d783c125b898e5121d4b7f87ef4e99756feeae2dba96