Malicious PDF — malware analysis report

Static analysis result for SHA-256 11164c2d8ec56908…

MALICIOUS

PDF

99.7 KB Created: 2021-09-05 15:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5316cf728d8d888c7d8291b7ba63e874 SHA-1: 6eba1b9cbd1547d5aa8170de49099317af345504 SHA-256: 11164c2d8ec56908a4b00f6cf8b325848b7ef56f4e100995aaac26d178fed644
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting suggests the document is designed to lure users to external sites, potentially for further exploitation or phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 http://www.naturhalles.fr/fckeditor/userfiles/file/30668260397.pdf In PDF document text
    • http://singlesync.com/userfiles/file/satulibedoradolir.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/11814111262.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/foxifivutodiv.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/setozusakamilufar.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/22776981722.pdfIn PDF document text
    • http://nenorm.com/files/files/gowemisumozawomub.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6h5avgmbg64upffnpiv4medih2/71178904180.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/tuludawotusimedotutiraw.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9775ab81d8---fozisojirosi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/98astcs93276ohoc0afepgb5na/21512921183.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8baeb7a882---derisasijaripup.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/rogedomuleronut.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/12679519649.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/85994272390.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1154bedb7a894428af5563f35c50e00c/nabonulozov.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/nejopize.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086863f9b8ad---57209875266.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/wuzeri.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/96275425173.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/31daed9c239aad34943d22b707f19a3e/pawasavuzavezolitefogo.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/tojela.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d3b87f2fc---dejejikaw.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/4477gskpm4g5ntoi2b022kfeeo/24095181961.pdfIn PDF document text
    • http://ccadl.com/files/20210730061223.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/6076358738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=retrak+remixd+truly+wireless+earbuds+manualPDF 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_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 19144 bytes
SHA-256: dd2926af784d9186cf5cdafe4aa40435f2570f18e16658a844f4ae4a3510d2cd
font_01_sfnt_off00014f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F03 10968 bytes
SHA-256: 39571db06527776409339569b88f149ca732f2386e20e39f4a189ba00abb53f0
font_02_sfnt_off00016888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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