Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fe7f36b6ec40fe…

MALICIOUS

PDF

86.6 KB Created: 2021-10-11 20:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 990cacdfddb596c65c933b1e82d517ee SHA-1: af41fa5fcfd623fc2032bd34e8fea1635d432edc SHA-256: 81fe7f36b6ec40fe6a3385d72ecdf43a91cab102b0079649aa83cd0317819384
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, pointing to multiple URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates an intent to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://promptcorporate.com/ckeditor/ckfinder/userfiles/files/fijimomukoluwovolun.pdf In PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/majazo.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/tizotepalokivirafebimozal.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07a2ccbc6---panotididavulevub.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d75336464c---84239989267.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/notimo.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/61722370983.pdfIn PDF document text
    • http://mama.plovdivweek.com/js/ckfinder/userfiles/files/17298614257.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/mutosuvoxesejedo.pdfIn PDF document text
    • http://autovoda.ru/upload/files/6735946763.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/29173281373.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/nidibuzorodopunuwuwez.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/bopexal.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/lebovurud.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/87384243000.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/wonenaset.pdfIn PDF document text
    • https://hinaweb.com/upload/file/xawaba.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/jotogamotekepumufo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615af0db47f27---75222376282.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/vopumabularenoje.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/lapeta.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/60210749322.pdfIn PDF document text
    • http://polishedskincare.com/minaret/uploads/file/sulaxapoduxiwexugexetu.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/14d802ccc724790f8c16c06a537772ea/66335973275.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=black+ops+3+multiplayer+mapsPDF 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_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 10964 bytes
SHA-256: dfd5a9968d5cf68c43024e5eecfb878421e3c5282b762958ee01935558bba4f9
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 18640 bytes
SHA-256: c0ce5a05f93e7a79b65b7d47555d3e580c12c84e2d71ac8325d3c4c80b51002a

Open this report in the interactive analyzer, or submit your own file for analysis.