Malicious PDF — malware analysis report

Static analysis result for SHA-256 1829e8a42a1599aa…

MALICIOUS

PDF

77.5 KB Created: 2021-09-18 11:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5fcf79d0bdd154006d6c8d16af3242ea SHA-1: 84405f3b8668e9f3826f7b5d3cb884966d91cd8a SHA-256: 1829e8a42a1599aafd4da699736e5d4e619d526fd8c57e8d2e3ec00299a3b8d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common techniques for delivering secondary payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=d%26d+character+creation+steps PDF link annotation
    • https://korvioinfotech.com/ckfinder/userfiles/files/ragelutovizumomadan.pdfIn PDF document text
    • https://ms1oke.com/contents/files/11814491857.pdfIn PDF document text
    • http://gptools.net/userfiles/file/jasisapifowepan.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/pitaj.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/79052060885.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/44306044883.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/84b9m69ggtmav3f8nact2mcfp5/ziwatel.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/89859143695.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/69123331827.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/kunem.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/guniwiwajawa.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/46683242297.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142272f84975---zuvosegeru.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4cc1fedc---82943750326.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d0a60e1733549458fd8b71fc79e6dbd0/saveminitozexoki.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614169b69bfe2---62701747675.pdfIn PDF document text
    • http://cga82.com/admin/File/logonagen.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210910_062144_6528.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/29887714743.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/wifokevufon.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/563c23f9815f4edb19e529fe7e7d9a72/zedovibamefamigagujokone.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/xojun.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/63352348782.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/12836114243.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/16287280042.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_off0000c938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000dbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 20208 bytes
SHA-256: a97d14f5a8ba68f0975872e427f05b8a7a911512095128aefc31f94b225261e9
font_02_sfnt_off000110b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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