Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e05d9d10f074e7f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 11:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8f08c0051dc0d30447e369e55a30030 SHA-1: 65d00f3063251b706388c1314e1e725160311c9b SHA-256: 4e05d9d10f074e7f24cf017cb354548cb0e6558b2f6511a53d2561bfd1396f5b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier strongly supports the malicious verdict, and the heuristic firings highlight the link farm and compromised host characteristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/491eba65779211a0301588ead63d61e4/motulevaxuwiwenenabakigan.pdf In PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/797676cc1084d9f35c55ac190d586d62/39406140907.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b30678a0d29---zavotovuxika.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/zojolatirura.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608472c05f057---68413347959.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/3jei944arc1o1v7o252tmrnboo/meteturikufa.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/fovokutusexafokaretex.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/u6r189qt7v8vqs6uaob7urns8d/49264307963.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/kulibodapudekubagokawit.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210807_E95B546A1D086AFA.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65d64a6349---53067042762.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9dd2711d---jixodivesojolesozat.pdfIn PDF document text
    • http://internationalbeautypageants.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/gabexinurazilojonoren.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/85770551458.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8dd371dc6---6154520926.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e4f436e037---nejififoxirawobamupilubez.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/lrdiah4r46odcmapkkaq7hc2d6/48192820072.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e3104ac7696c7e254e54d31cfc50525b/tobem.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/xurufuwodofez.pdfIn PDF document text
    • http://jimigubellifoundation.org/clients/f/f9/f96c94eea877db95ad0a8b6fd709b1ed/File/91808565530.pdfIn PDF document text
    • http://quetthe.com/upload/files/kopalebelotabid.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/wipovexa.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/pazaxowagofigumusifuwo.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/pibev.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/26905858297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=starbucks+nutrition+pdf+foodPDF 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_off0000be36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE36 17180 bytes
SHA-256: 437480b2951f75440c84269bb5726192f3c9199344c9f3c78ad80460ccd8c659
font_01_sfnt_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 10840 bytes
SHA-256: 3e4c44e6f21bd81f978db81bd0b5d67e0cf905ea0026d76bef5c848f2fd6590e

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