Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9cd4b6d9eb6477…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 13:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 624ffa0b6fe90711e3aa1630063d0e06 SHA-1: 4a22665999b56916a86a8a9aa9ede05962c17a21 SHA-256: de9cd4b6d9eb6477645001ab7d4beae8c474246cc5f2c4af91b6d880c209c704
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to distribute malicious PDFs. The presence of these links suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/0ea831bc8689ab1b51f78451d89ec1a0/xadakasodonojolavag.pdf In PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099ecd733dc9---98804255832.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/32338236510.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/xuvisutuliman.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/86954968449.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/60904260624.pdfIn PDF document text
    • http://learningkey.org/userfiles/73376232400.pdfIn PDF document text
    • https://blokhol.com/upload/files/xekefugutamexo.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/25914882890.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/88860982894.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/22516942294.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee38e4be5---poviren.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/bebotidepolepulak.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/kedenetupumiweraw.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/bcea198b23b20e460ab02cbc8226c2a1/bikiwukumimewe.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/322aaf7a165fa2d4fd78299cb7b7eee9/palatezeroputu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d1d51d9e6cc2d76acb6c1c3b5b7c983b/99590228545.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/marunimumomurupokiduzepu.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tajumitoke.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/32135750573.pdfIn PDF document text
    • http://gojjang.com/uploads/files/vukurapepapopufomobasader.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/13615916902.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/54213700980.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/62677855514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=english+grammar+worksheets+for+beginners+pdfPDF 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_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 11244 bytes
SHA-256: 9b7a3a45220a0212f8b6e6adc5725566a1ad0337da18c51b695afac82d40ef0f
font_01_sfnt_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 17608 bytes
SHA-256: 19746a60e1efde1544f335f0cfa70b17b8de35fe58fb828b092451c241b4d4cf
font_02_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1