Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5bde2f08f38159…

MALICIOUS

PDF

91.1 KB Created: 2021-08-08 06:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb19c048253d120c55eade43c0ec0249 SHA-1: 0725d22cc25ffc15d1abdb63e705e96cb35e9cae SHA-256: db5bde2f08f38159329efa0ba047db446855fb83571b8ae880b981c9b9780c3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to farm links for SEO manipulation or to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779f167b200---tesunipifebibatore.pdf In PDF document text
    • http://jungam21.com/upfiles/file/1628371020.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/69bab2ca7100b940fbe152320a1db422/56968564757.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/xanefokosipozavi.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/61393573771.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084913589f78---keramoviweteratesuvefufi.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/ziraxoraja.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/27915588044.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/ritunagovalezibet.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/49616160195.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/guzozaxexowaseda.pdfIn PDF document text
    • https://thenavyaindustries.com/ckfinder/userfiles/files/85374905648.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/87941421632.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/be6baee40af7214bff2151f9c6c18b4f/46027539030.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/kisukapunij.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/47151573778.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/13268833025.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/34117002949.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/balufikonimavojebozuvi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc84eae544---vorobovik.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5d9e848d59744be4c99b56271a0b066a/zuromijijovujumukolexez.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5030caa0ff0ec7942e2acee064a73f9f/55482523600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sap+business+one+blueprint+documentPDF 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_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 10992 bytes
SHA-256: 46ef1c5dae87ee6a581109b02912df36a8efed8453b06ca5ac6a1e39c29d157d
font_01_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 17240 bytes
SHA-256: aa265fc165ce09d3f163db4e52cb58f19b94bfa409b9fbed977173ea55747eb8
font_02_sfnt_off000145fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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