Malicious PDF — malware analysis report

Static analysis result for SHA-256 da280bb33d9f5cc4…

MALICIOUS

PDF

185.5 KB Created: 2021-06-28 19:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a22782c6d511d81e52beaedf88e8fa2f SHA-1: ecf5214fc011a6cdf0cef633094c787d5269604f SHA-256: da280bb33d9f5cc4536a9164a398e2e1fc0ebc6abea2aefda7451c30caa153af
96 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to leverage external resources for malicious purposes, likely to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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://drafthe.ru/uplcv?utm_term=1st+timothy+chapter+3 PDF link annotation
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608450473d97a---41001414269.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a4b986a4---87452277603.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/5263da57ed06837fdccf8e0d040afc6d/17485088901.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/nedib.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/s51pipglq8pv1ardlcsaatc902/dobinupu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924fee04e28---vixajive.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/gadewiv.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087f38e07cbc---35345393002.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6d5a1809b---zizukewolise.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/xilatafirir.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/50123363356.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e20299816bf1ce343899a26629b60cde/77548883693.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/36596031035.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/31355787653.pdfIn PDF document text
    • https://tavio.ru/files/file/63815866821.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4d5339e2958448e4daa837a34d6325db/japefaxexa.pdfIn PDF document text
    • http://aps-mes.com/files/file/27209373241.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f36311bc9a43c1a11a226596a643c005/dikozojerapuvujekutelizu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d052ecb579b---pedudoxidaw.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7129f2034---kifolejinurubaxuxulexazid.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607254a53413e---xodorasinisuwuxikize.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0c7c3921---mitowisekifesonasurutamo.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/559597f21e469684445a37606422b26d/madagox.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B75 17136 bytes
SHA-256: d425b1c56bfdc9b275fb2a07c7d13b026e9ca4b7fd78026ffbba2e3181c190d8
font_01_sfnt_off000264df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x264DF 10732 bytes
SHA-256: e67fd1c3b6f82ce1b881fbcb44e26490325e588138d7543346147d1c65a4e82d
font_02_sfnt_off00027da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27DA7 30564 bytes
SHA-256: a546997150e189dda7b6bbeab20acae9887b87e71046fb44097003c37f0a4108
font_03_sfnt_off0002c006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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