Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca948a3c42d44c5…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 03:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 547ad5a2465ed8a102cbf1cbbac3bfbd SHA-1: bfaaed1419ee90c37d3a0f8a7b0fc445de03aeb1 SHA-256: 0ca948a3c42d44c555bc14b5ef262c84588af351df52d062def368ccbca16fd7
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=comprehensive+practical+chemistry+class+11+laxmi+publications+pdf PDF link annotation
    • http://eurekaelearning.com/upload/news/file/devasutixapas.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b52d23b0278---tikugogisuragowelabo.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/giziserozejakito.pdfIn PDF document text
    • https://triosms.com/userfiles/file/2380699700.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/da6tes5k6pana8kbltntjepdbq/mezizefugodipedava.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e0cbe1f2f---40719934280.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/famafosegewape.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9a0ce8f68029c2ca606ef19e387a9fa7/sukipetexumuxagurog.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/18305742400.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/80698805257.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab776c35813df6f0437b07b06b311086/43621618622.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9b871c2b8d6e9c3753165c5fa624e86b/77325998622.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/repotuleb.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/39220832880.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/4p03prh7aniqvhl5vbfg6g3vc1/29662385787.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/16928247368.pdfIn PDF document text
    • http://lagrupacio.cat/file/nunapatiduve.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16083671138742---40307525656.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b4a0e05d9---88293827765.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/goium0an26dkg7muhjf6gevovs/30365243039.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/86890173580.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/56854614866.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c36eca8eb66---4306635876.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_off0000bf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6C 11492 bytes
SHA-256: 1f8c14c18eb0d1c0fa671438328758b9cd3a34350f9d311ba9810b41e92ce06b
font_01_sfnt_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 17468 bytes
SHA-256: 469b9c823bc9d41176119c3055576ca6977596723cef1ad210d123cd48ce2ee7
font_02_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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