Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbacf09e78a3fbdf…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 18:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d29d5d2cbcc00c9581c3d3f18e9ecd54 SHA-1: 1a222733abfb83e2abfba5d1942385619114ea51 SHA-256: bbacf09e78a3fbdf2e3eb351258de518078e050951d802a40d64da4820cdbc90
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to manipulate search engine results or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing malware or facilitating phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chip-chup.hu/upload/file/46436579622.pdf In PDF document text
    • https://vvpta-irvine.org/userfiles/file/puselus.pdfIn PDF document text
    • http://dr-temt.ru/images/file/gikotiril.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/20202189722.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136eeae3113e---lokugiw.pdfIn PDF document text
    • http://strap.sk/uploads/files/92249487175.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/lerujixonu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135fa2f13a7a---13544027372.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/jegosasovibakegimuser.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/lazisaluninav.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/ropokoboka.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/mudadapadovot.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/12513244164.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613300e8e6b30---77662966204.pdfIn PDF document text
    • https://korankertas.com/contents/files/petewarut.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/19145262275.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a63eb6824---suzijidukupovoronuxozoxoz.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/72331675705.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/62117c38cb2b76dac7b3f809ae6e138f/23737467436.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/74180630913.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/dedizanedoj.pdfIn PDF document text
    • http://www.grifin.sk/files/dafawivufizekekufud.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/zesosutujuvidizifageke.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210904_8F1E03591391F3BE.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a29b1bbd4557d2fafbf4903100095c0b/73351084085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=uncharted+4+mobile+apk+downloadPDF 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_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 11016 bytes
SHA-256: 508309a8c2fb181d937ba87c0c5bf7d88b45fca9ae9a08838441b44d67506ba9
font_01_sfnt_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 17744 bytes
SHA-256: d5b2aad58303e0d6cb953001e8d54c8983e6080afb46a8a652b0410fa00052e1
font_02_sfnt_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1