Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bf96e198068f6c…

MALICIOUS

PDF

87.5 KB Created: 2021-09-12 08:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73f0d6ce61826bf6dfdf4720d333010a SHA-1: b26a8376ba23c36205b465cc4236994209e1b081 SHA-256: f6bf96e198068f6cba7d6b39b0a5159d538c944d3b9b9ccf79c7de0e573b5236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous links and the nature of the hosting indicate a likely phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/84823770d342ae1865babd40c0780cc8/12180453274.pdf In PDF document text
    • https://trystsalonri.com/images/file/92599134601.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/84520765416.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/18b066166e8c3996aa470b22c04348a9/13510680268.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/11602650747.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/zexuwe.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/16405626390.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/lonobuxepive.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/48781448304.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f1f17516---39345441330.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/30245516387.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/k2a2769s00dfcv846491ht5k51/18794433668.pdfIn PDF document text
    • http://jljemc.com/upload/files/99053328457.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613673fa66351---lalemav.pdfIn PDF document text
    • http://mosjob.ru/images/file/mezeposigikedetedewum.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/soseju.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c5dca27b---verumugiwome.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/gozotofodexe.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/zasaledodegub.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/27926985261.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/dinuvixobaxige.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/72293672484.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-5/20210905035842773564.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/22253739816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=who+can+view+my+ig+storyPDF 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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 10892 bytes
SHA-256: f84635fd8b7c16729cfd1c5ce77645186aa8ba8c4d0c90ab871d2907ff2b1f06
font_01_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 18504 bytes
SHA-256: e8e5a5eec1a9e9be01a2437076ab6a46842d41a80e9c529659ed8b2687d79240
font_02_sfnt_off00013869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1