Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6da937ddb4e9a2e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 10:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0c2c60cc3e1018ef48cc6f65c11caaf9 SHA-1: 1ac5425695617452d0ad885c2659d5275c50fa06 SHA-256: e6da937ddb4e9a2e59f93d3788847429d093bc8cbefb8db2abe1af8e9cc91ec7
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on disposable or compromised domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure further supports a malicious intent. The embedded JavaScript likely serves to obfuscate the redirection or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fra2ange.it/userfiles/files/fetukoxakiborimel.pdf In PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/57666018992.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/87697687104.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/60536283618.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/76631474190.pdfIn PDF document text
    • http://hueide.com/upload/files/64921257820.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090800335580554.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b4a6ae788f0be74423dd9e3afcddc112/tojujodela.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wefavopewajonarakak.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/xudorovapiveguremisijog.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/9bv08ej7tcm1atngfbm7s9krev/74275329920.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161339de9449ef---63082105233.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/dojekove.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/49081810694.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/27743608512.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/bepalafiwigexop.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/96963298777.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/3812899980.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/69301695026.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pololazozilonibifizun.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muwibegit.pdfIn PDF document text
    • http://poiskvod.ru/images/file/rosomuwekig.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/92464653035.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/pikurewiwafelor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=exe+file+opener+androidPDF 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_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 17712 bytes
SHA-256: 2413454afa708848ca2749fb60bc1cfabc3ea8ddf90008aad1389d9abf5e5f41
font_01_sfnt_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 10312 bytes
SHA-256: d516ffc16eea80a3648c151ac7364f4359296e4a01ae3265ae9812b64538fbb8
font_02_sfnt_off0001154b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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