Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0916cd19b446e3…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 09:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b777ec7f4f335d6802d4e38fc2354cf3 SHA-1: 373b9aa0b287eae6e0c85d0d636f39d1fff17b19 SHA-256: 6b0916cd19b446e33aa7a4a740bdede918fd91fe930e0a26ffdb0093eeb2c522
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, with a high ML confidence score and ClamAV detection indicating maliciousness. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a browser extension or update. The embedded JavaScript likely facilitates this by interacting with the user or initiating downloads, and the numerous URLs, many hosted on compromised WordPress sites, serve as part of a link farm to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed08c105f1---91031862257.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076702642fcd---lepixonipak.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/xerufudutadapenet.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a114fb98d3d---zelekajatipakonekusu.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/zawuxazoretifiw.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/mefekulet.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4iilkp2rej8rb66voad36bo587/79404769753.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/71266189154.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608db1423eee6---83304880093.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c22a01cc9---7785152251.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dcf569065---76159142583.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/67356678020.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/4464933018.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/zared.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/4771366026.pdfIn PDF document text
    • http://dyweisheng.com/uploadfile/file/2021072510555373499.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/56811388401.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/47f5571e40a781189730f5a2de6705f2/83925136393.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/xizaresuf.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc5ffe9e6b---zolapimiruxosiveve.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/35040137302.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/d973532238008626693574f1be8e38ff/fonepebopo.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/65786767442.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089321c64601---28579281751.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/66194500190.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/48588539405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sejarah+napoleon+bonaparte+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068
font_01_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 10680 bytes
SHA-256: 8ab7a692653435cbd5297b7beef9d04d829767c28c877836582f4f41c8848324
font_02_sfnt_off00010768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7A 17896 bytes
SHA-256: 2687be707dea5b4c327c2a7b00800470e4d3fea9edcaa71fb031185f2ed055fb

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