Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db2ef55d386bd28…

MALICIOUS

PDF

102.2 KB Created: 2021-08-11 04:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 011187ddf27896d80132d96772fb1a85 SHA-1: 375ce4d80a461a2f2a21bf7df7b07a8ee0372b1a SHA-256: 2db2ef55d386bd28441f369055450eaa5ed3cc1ea70a1aa2a30021c995c3c5c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external links. Many of these links point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript, while not fully analyzed due to obfuscation, likely contributes to the malicious functionality by facilitating redirection or further payload delivery. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://enjoy.sk/editor_uploads/system/files/63838283191.pdf In PDF document text
    • http://altinay-law.com/images/file/rupeligupagebefowusolur.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608145557a1d5---89963927790.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/51250195351.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/61835218873.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/606d8338f618793273f76eb71cf5ca51/28367237216.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f43a74abe4b---batatodajivuj.pdfIn PDF document text
    • http://huntland.hu/upload/file/lijudepezezomuxix.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/91389579233.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/57443922926.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/31995578420.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/fejobepo.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/59294632423.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/fitovotilimofula.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3a777a08---lakaganikufokimuveve.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/gowolufirodubaveta.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/kapomeloxezajuniz.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/zurupifimapikeleko.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/58831274332.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e56f55bfca---24293194969.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/368ea0b6d95a97b2f5f82bd8c7b8b5fd/96575663787.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d0da24049bf1592119c3c7604d49fd9d/waneviwaruvovujimesovan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0a3e7551---84709210710.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fd50bb2b567---pexevamaxenux.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/3625903841.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/2nppqlvia67bhr6vnrb1v8ank1/46018538927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=que+significa+el+coraz%C3%B3n+que+maquina+pensamientos+inicuos+en+la+bibliaPDF 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_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 18044 bytes
SHA-256: 37d06393fd2991f3fef34027338d10bdd074cc42ae8e11acdebbf898f7720bb2
font_01_sfnt_off000154e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CFB 11468 bytes
SHA-256: 1f3b058bf541a7a9cf1ff0244798e659df53a9567507b29ffdd93747030d9f5d

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