Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70b21c1568e7976…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 08:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e5d4ad1ad9c5243c984e569fca98695 SHA-1: 06815dbd44bd16a4ee618dc1cc2cbba94d530c66 SHA-256: c70b21c1568e7976026e08af4a462e4c5b06aa30a1ea92ad82e257d009f4e28f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The ML classifier strongly indicated maliciousness, and the structure aligns with techniques used to obscure the true destination of user clicks.

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://laborke.ru/uplcv?utm_term=skyrim+marked+for+death+shout PDF link annotation
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mmtc5ceca5n4cc8i230ok7lm02/lebobuxebijokugubegosiwud.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/jusaselofufuvulik.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/kadun.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/56401172094.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/78b8641845dcd8d3b52dbc99fa04e4a2/zatizitowexituxixi.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/80958059431.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/rovadipupalupadudomam.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d246787b949e29346a6e49a01616fac/19932661027.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c913faccc6---koxosuzinodude.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a3aece89---nuparise.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d566a6ef---46964109219.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6c05692ef---60154616979.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/201365640612cc4cbef57f.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/zogesezufikafa.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d2ba651cb---3807405126.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/vuwifukafuvamovebuv.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/jukasezu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/f03615699aeeff9fc8765be247032be8/pibelutoxufinemet.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7f6cd4bb---kolawufiror.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/davasolenulepobowa.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4b426d539---bopugosere.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/99402098351.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea4b67e11---womozizof.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/lirenuzazexizamojupogefes.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/gi9mipn9d2g7mmg06ct8v9s8u7/35596167316.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 10848 bytes
SHA-256: 7752a6471ae3074bbdec61ec700ce69b3bff3d765e4559f05020f309bb345bda
font_01_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 17920 bytes
SHA-256: e03ef391bbc48d60e537f61e090b02e256471b32f3769dc579d52a7410df2e78

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