Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c08bc06f667f7f0…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 10:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bdd79464a6391ac940ac35f95aff703b SHA-1: f987bce83b40446fe6d19baa8434aba6cfb63421 SHA-256: 7c08bc06f667f7f00995ef357022f4991e14e0711cfd64d6701759ddbedda0c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to lure users into downloading malicious content or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=granny+horror+game+hack+mod+apk+download PDF link annotation
    • https://smshealthcareservices.com/ckfinder/userfiles/files/1087580797.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/118bf0827ef85ab95cf01ae4992eebb0/kawin.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bd8a58ee0ac9e4bd30b43f643b83b85f/sazapebegurobasaxasorev.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/jukefirarosugosedojomada.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/19487399693.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021091819590870554.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/91b6a0ae426a4abcc78fc883b0f152f6.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/sexonuwurovimef.pdfIn PDF document text
    • http://modern-pro.ru/files/file/43843030967.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210920_E0370DC0DFE665B4.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/71323253692.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/32708476296.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/313d8c26003a860bcb91432c2ef96c2f/japekanawusegusomuno.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/turibatowipop.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614209223a6dc---20554324067.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-13/20210913192246498664.pdfIn PDF document text
    • https://pixel.bg/img/file/9484700512.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/muxixep.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///rifawetalaka.pdfIn PDF document text
    • http://kmsenior.org/file/files/lobuwifafikudixezitokuki.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/suzinavabusupajo.pdfIn PDF document text
    • https://invision.buzyhub.com/files/selexogonunuduluk.pdfIn PDF document text
    • 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_off0000b025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83C 10936 bytes
SHA-256: d20ee733c5f642054a0719b71b75c6ad0c0006d994c3b5afe868babe7f3a02bf
font_02_sfnt_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 15480 bytes
SHA-256: ad530f0a8d9e6aa4b5b2aace908544dfd4140e613a60820334058434b0ce3444

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