Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e812441ae1c7f9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 01:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 07a6f19ff36c4de449cadc065e787123 SHA-1: 8c109681dc60d533afd8bca65b03eb3544936097 SHA-256: a8e812441ae1c7f93118776d13eb89928528f62c67a9fb4894b8e23d7b4e0f68
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised CMS uploads and disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to redirect users to malicious content, likely as part of a phishing or scam campaign. The embedded JavaScript is likely used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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://dalba.net/other_files/File/90449533565.pdf In PDF document text
    • http://wadsoda.com/UserFiles/File/38758124650.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/64259693855.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/27190867408.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/kixidovowoloxoragez.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/82520658471.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/67369680361.pdfIn PDF document text
    • http://gardatrans.com/content/Files/vewate.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/13376606752.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd000eaa69---87661711378.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/dexigo.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/safimusivarajizuru.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/8540958204.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/40022e1b6d5e8fcc8e2fee9f2003a708/xeguwixawemira.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcfffe044b---fisawufubijebobemad.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/nubojomovuwo.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1630772055866.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/ledafusuluzurifegix.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/pijubukojafiwezobikojaxi.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/61670549400.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/dokipewowena.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///23921471498.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/32833783537.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2e47e074494ef200a4fd99da18a6f35a/dawudozatarurojosewelovi.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/02ef992f65db391e3e01f521e186874d/4790446129.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/47997703787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=crictime+live+cricket+2018PDF 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_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 17864 bytes
SHA-256: 3641e7a27a1525ef3d067f0e8c60d6ce5507f66310df491816be51e3c7f009ab
font_01_sfnt_off00010579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 10528 bytes
SHA-256: 1e4bb13aa2c9704eea92c3fe14c6d50627d52e483207b8464b9caa518c1c6f25
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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