Malicious PDF — malware analysis report

Static analysis result for SHA-256 7797cbb7a141ef83…

MALICIOUS

PDF

84.1 KB Created: 2021-05-22 01:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 56a14e35624442f61287092944ece870 SHA-1: c6964d47a5006ad43f5b56706850dc2026d12062 SHA-256: 7797cbb7a141ef83301e2510e0938200d4c746a574a715996c6e184cbb43f973
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm pointing to compromised WordPress sites, likely intended to distribute malware disguised as software downloads. The presence of multiple external URIs and a high ML classifier score indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest a mechanism for delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://poolpoint.be/uploads/file/fexeju.pdf In PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a822584cc59---xilukefifumefalo.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/444a054334180017fb2d2fc446407f42/15808769159.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078441b069a1---gigebuwoxuwaxupuw.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a574f5606e---leguzowerid.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/xiveb.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7956bc34f1---73085464025.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072b42b3c144---xexuvopaxan.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c6f4d2dac73b81b30a14f0a063c24ca0/46465967755.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fb63a5ae---36110565869.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/50278717842.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3d619223feea8e97bea7a4976da5c46b/96487387955.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/wirorap.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0cfb88b6---fujunifaberoxafabodaliki.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/tarel.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077cce12ce95---wosezogobelerop.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/vaderopikel.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780ae7e2776---37344198134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=age+of+empires+3+full+game+free+download+for+macPDF 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://scripts.sil.org/OFLIn 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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 5524 bytes
SHA-256: 792a96ba379719020be2a7e7f8b4c1f1a04cb14361a345362eaec033b832524a
font_01_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 10980 bytes
SHA-256: 1dcea7022e864534aa81457e0b0fb9e0919faedc7e9fcd9b5c439e8747220c6d
font_02_sfnt_off0001189c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189C 18008 bytes
SHA-256: 43592804505b013a5066afafc05009856aea038d93cc03d37991b3bd3c7422e7
font_03_sfnt_off00013453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13453 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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