Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1433a7a8074188…

MALICIOUS

PDF

93.5 KB Created: 2021-06-07 17:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e7fc50a535f0da8e5988d80919559448 SHA-1: 300f331f18e668e0fdf4a3e8704eee326f33b90c SHA-256: 2b1433a7a807418801c6ac653fb483d5764a2db6a3edcaa608cb6424c0f17147
96 Risk Score

Malware Insights

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

This PDF sample was identified as malicious by an ML classifier and contains numerous embedded URLs. These URLs point to compromised WordPress sites, suggesting the PDF is part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to potentially harmful sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=definition+of+direct+and+indirect+speech+acts PDF link annotation
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fe5e7af0---92485392215.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5583aacd7---lapajiluzesowipofam.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7ed0737b3f73a7f105d1bbaecf5f5c33/fomababesexow.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/22405228434.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5058c225952e98c99c54e8707fa3cb52/xapitamixepe.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/64d97d084629d6d79cb599224d43b5d9/mikon.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a209a6d7a68---zajixudub.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/732e55248c4f20038f67c5ea09044e05/43071508972.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/4981046896.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/25064626373.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5045a2b8d33b2a48356ad7832987fec8/leremeveratawopekodebu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cd5a246ee---89637331617.pdfIn PDF document text
    • https://aedwea.com/upload/foto/32597026228.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/fivoxiwujasidivaror.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/wofekakiki.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/hdgf1f3sdn82474nk8cq0abnff/mobarefivelu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/61785578148.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13099 5212 bytes
SHA-256: c7e8289be783c86ec64bb03d7c9d75c39b40d9f6c9956aab4a4778110ab6ced2
font_01_sfnt_off00014254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14254 12004 bytes
SHA-256: 0cbe236c9dbc18c14f012ca9bf2ec7e7ef8f79dfdc7e06007e4e00ad66719ac5