Malicious PDF — malware analysis report

Static analysis result for SHA-256 d534bd0cc68ccf9c…

MALICIOUS

PDF

94.9 KB Created: 2021-07-18 06:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a2430908e7e008496ed6e136f92901d6 SHA-1: e5730d0686462a31cbf4107a6923471b5b4fe9cc SHA-256: d534bd0cc68ccf9c466127c367baa89499541fcb36d93b66c06d66ee37b00496
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. The ML classifier strongly indicated maliciousness, and the presence of multiple distinct hosts hosting PDF files suggests an attempt to manipulate search engine rankings or distribute malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/d1jb47djfjuhjh6lld7dipavk2/78579434830.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abe75700c8---sekapivasiwavegufa.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/zejixopudekuvefelod.pdfIn PDF document text
    • http://minerva-collection.net/files/files/81024823776.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/doxizejobofan.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/134628b43d148b2028fe7d01ee2c1e04/8287332385.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/6918147841.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/56253884430.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/82881086181.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/18888392142.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/91804324624.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rinujurosaponal.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160949001951b8---83827746589.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7cb4899fcf62e157cfdd53a655320008/zefomenetejefuzoze.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/980ed6b548efa8e267a2b82377a2731a/85218515351.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160acfb72c1f01---12217730924.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a66a3105a---bozivesuvugazib.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e355f72840---13759531070.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f34a80b5901---94770341581.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ee2a3ef12e69db430fe48a4fe2f78d21/teweverejefaveda.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1622168484.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160780ca2126de---vijuxofojiwonapokimopuf.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/13726a991a3f92d907b255ec90ff94e9/61604241605.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf9687b58---16297931604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=java+copy+two+dimensional+arrayPDF 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_off00010db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB6 10932 bytes
SHA-256: 953435d6b59acf629a2f04fdb005c7260ec00fa79ae6345e5c1146d400d7c12e
font_01_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F37 17728 bytes
SHA-256: 7a7032b84c12398e0ae04c8b7831c9c2d331d4154c40fcd6e1e5179b8095a04e