Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3297b2c27b6ce2a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 14:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77b5dedad09c72b706b231094289ebe1 SHA-1: d1d3e848a3e7fc7ca43c0459a8943fb01d85a141 SHA-256: f3297b2c27b6ce2a5fa1a6bef111b4de55d21e2d8418f15333878d3278d799d8
136 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of multiple PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the malicious intent of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://jyjjapan.jp/files/ckeditor/files/zuvuminimunu.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/9f082a94e9d5dcf541fe4d00277649c9/rigiwanalukabavulafo.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161414fde59220---vudoputusavowudeguwag.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/77066327911.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/655382554.pdfIn PDF document text
    • http://telecycling.org/files/file/vesovebekepovafuw.pdfIn PDF document text
    • https://simorgh.it/uploads/file/27027863257.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/dc5d4e7bf018eee938ded1e20a0470b1/4438092578.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/30942379409.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/82899433352.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1ddc25a8---notexezofelix.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/sonepapave.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/82cb397cf42841c25a6962ffc0ca6534/lasinamowulirunot.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/gorulixizagar.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/pogodeduguxopazetapa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc9762a5a---16528032289.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613501ea85853---77325768089.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/bavir.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/fodamamanimadavijij.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/jaginusulafawavojumuvav.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/fedotuluvemowevipudimodam.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/17718972641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=betaal+watch+online+freePDF 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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 18168 bytes
SHA-256: f8917504e8b258af2f19764b1d5fd82c3d62c00d7086b2354efa1e3e9e94bcba
font_01_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 10404 bytes
SHA-256: 74bbf660202a5f402baafc8800ea5168b40a0d9936a62a49061321c9fea6ff41

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