Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f66a1635e1f7dda…

MALICIOUS

PDF

72.9 KB Created: 2021-09-06 12:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 938c89a2685f78456519abd682c037e6 SHA-1: e4bbcadbe081a6aac5e015f49758c1d83ffdb9db SHA-256: 6f66a1635e1f7ddaeb929f8d343e841c24c2273626f2dff0f65e917dfb91a0ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://rheinmotel.com/userfiles/file/peroxijowiragi.pdf In PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/82714929020.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/xedenanotisatamufusede.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c39d9e5455---padalese.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46937b2633---kaseduda.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/86137986132.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/lusigebowodogozikilusuwi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2ba46bdb6b09c74dcf289ba45d3af7e6/vizegipi.pdfIn PDF document text
    • http://atrsara.ir/resource/files/pezomijidajomubodizikos.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/76758420401.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/rivuzomepidosapojifi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d96c1d57e7daeef89750d1b2f81af191/rirubazope.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210528093022.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d777dcc2ac---46382475739.pdfIn PDF document text
    • http://houselandia.ru/files/ritavet.pdfIn PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/kufegopuwiropawogotagitoj.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/fujiduzimiguzomujawe.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/tokanavesuniporefopojepu.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/38525940861.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/sexunusegifatofe.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085c27829773---nijubawola.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/11492692524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tabela+periodica+da+uerj+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_off0000b4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D8 18548 bytes
SHA-256: 27d9bf17bb742d48f67be9de49d3d1cac03502e8dc5719bd84ce303b672475b4
font_01_sfnt_off0000e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 10576 bytes
SHA-256: 6b56fdc59479bf4ad0a3b7152ef94da923309cd4cc6c0624f2f4cda3002fa179

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