Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac86a281169a4cc…

MALICIOUS

PDF

76.7 KB Created: 2021-09-21 01:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82fcb7651c51d29f68131b3f16da0d75 SHA-1: 0b81f2d04538f5d02873875e5e3d3af167a78d77 SHA-256: 8ac86a281169a4cc0338cd1b51469d72bbe34673139ab13d230e9f94b99c41c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs indicate a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://gyarmatilovastorna.hu/userfiles/file/luxufos.pdf In PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/741f6883268cbc09ed475bd1088511c0/7214252943.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/54684048208.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/88448598082.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/29093104238.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///nozogokikuderamoxiridon.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/29794243027.pdfIn PDF document text
    • http://machulski.com/public/file/sufebal.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/322361665.pdfIn PDF document text
    • http://mrybalko.ru/files/17618125529.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/meronilopifijisilevose.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/mubukabedeliv.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/tevidukatoxigenubopa.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/gatilobawonozubimagop.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/lizibadif.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/firosepezalozizumelux.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/butidatibusivebimelat.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/rogijagibikekudaxaj.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2ee84bf06c95cb2be94f52ca130a1775/86763952059.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/29c2e7150a2693ccf2ec63a6a67af6c4/jujifawovikazuwitidagitun.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/98347175767.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450cfe1fdcd---jokezoxokoduxerujaj.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/18335101039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=super+vpn+latest+apkPDF 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_off0000c9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FC 10368 bytes
SHA-256: ea2c6a6bfaf482782786175d63bd6f66d3400c1e525feb08b4b8a87eb5a3fc23
font_01_sfnt_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 16868 bytes
SHA-256: 8efe2754a2597acdd859ad93249dc20451548e2e7e47843b996bbef8b3745581
font_02_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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