Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ecd7d6055a8312…

MALICIOUS

PDF

74.1 KB Created: 2021-09-24 11:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7a1cfe072c9829f93c962eb1ddcb9b87 SHA-1: c05f3afe1000914f2c7c5f30255c7d658280edfe SHA-256: 43ecd7d6055a83124d543fc6cdb6eaf2d8d59866cf7dee48c8c7d4586f53565b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm or SEO poisoning attempt. The presence of embedded URIs and the overall structure indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://fibaquitaine.fr/cebatrama/userfiles/files/molarujeze.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/lebomijimulofabafip.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/163198787111ff15639d0ed517c7a.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/66560861846.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/36e0cfbf5f4feac32f2f624cdc87c606/82842706962.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/61678997303.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/78465861362.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/pixizobapuw.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/56019635062.pdfIn PDF document text
    • http://pinxedien.net/upload/files/nezovatasezimu.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/vasulemovo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf95fb4d6b---jamerapobudafelekuse.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/xovisubofofikabu.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/voporali.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/nerurizof.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/fexitififogolafif.pdfIn PDF document text
    • http://synhbio.com/upload/files/nomivizixuvejewawakofiji.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/16964517798.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/najugivipoku.pdfIn PDF document text
    • http://sb-78.ru/files/file/1968188656.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/18066227430.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/60278033349.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613761e39179d---45478920594.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/romemibepujubeledutaloba.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c258b79051---tirojomu.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/kijilopudobup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=galaxy+a8+screen+sizePDF 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_off0000be09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 10528 bytes
SHA-256: e9cb937c0ba2dea14565f4e7cb042c99e2acb185fa6a3e2045155272ae8bb6c6
font_02_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 17200 bytes
SHA-256: f415b1238bfaee1e6ce9b91593fae3af2e9fab062ce64ccfe6ab1860165ea8dd

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