Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15867315111d768…

MALICIOUS

PDF

85.6 KB Created: 2021-07-02 08:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d241ef9f9ab27bc670684c83cac52b9d SHA-1: 5f4d648412f48ca2ec974a5cd2f1d2c39e4e447d SHA-256: d15867315111d7689bda647a4e1e56596651e30b70efa79b3745afec0cca9c96
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to redirect users to potentially harmful content or exploit vulnerabilities. No scripts were extracted, limiting the ability to determine specific execution methods beyond the inherent risks of following embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://trunglamdecor.com/uploads/userfiles/file/29704429105.pdf In PDF document text
    • https://ajitcoatings.com/uploads/36029351640.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be14c09890d---33787034476.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/7035a5e30be1770161ce41399872d20e/fobeguzexagalogiwev.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/06d7930b7ce7c501dc91ca5fee0f0d03/tomimizavidiganasefol.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/gijuzomusewotuxozuvulir.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/49685131063.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787ffde4386---21996559638.pdfIn PDF document text
    • http://coffee33.ru/archive/file/fatuxatixiputudilu.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/57801170295.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712af49b8be---sejuzaguwelen.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4de2beb775---70318185784.pdfIn PDF document text
    • https://aedwea.com/upload/foto/topoletivodidapaguk.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb13203b19---josotusifubodafejo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607458ad1b623---97646146385.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/mixatowalafudixobemuleroz.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/68770209183.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/48gtlupnlf8lhere4gtl6in6ga/nagejejajotonetalazazi.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/jowekavorezovozega.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/sumox.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/paniloruwalevuvo.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/69177528121.pdfIn PDF document text
    • http://gyobel.it/public/file/gafabelubelis.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/781426a9a06aaaeb3923cc0c62267381/51054846945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=struct+in+struct+c%2B%2B+examplePDF 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_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 18016 bytes
SHA-256: 82049ad9984e5a26f18a4eab4355cea36aa2e8a12aadf4e66eade8798819f8c8
font_01_sfnt_off000118a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C0 10692 bytes
SHA-256: 93384a16c84300ac89edea821474802252e7f3edfdde29c962c732b2df064b3f