Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ef08b5e7a29a70…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 19:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5165ffe221a02db913601186cdd7482b SHA-1: db03bd89bd0d31939133ceaa8401b6e0fbe17980 SHA-256: 27ef08b5e7a29a70e73d1006d9a39364d9e32ce5d2d1295c1cc689791fbff8ae
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute phishing or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=descargar+sygic+crackeado+para+android PDF link annotation
    • https://estoniapools.com/contents/files/15660287670.pdfIn PDF document text
    • https://aokman-drive.com/d/files/31194894908.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/35537312973.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613abff56d155---bivubuligazakajup.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/mujofirusare.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/89006187132.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/48240129348.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/gerolizegifexirek.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc85ab88c6---jopama.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/wavakodesegileraxen.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/07d5abb10148dd62abd67e014beca252/pitigujavuxemujip.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/54224838882.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/25933599619.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/23195285053.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/97302040332.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/jaleluvapaxirasigi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c04ef398---26153415534.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/61084611816.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/98930541288.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24d5af3ef---68463126148.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/42086598615.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/niralanimapegeper.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/barelomapevawux.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/doretoralilifepidanusuvot.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_off0000c977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 18232 bytes
SHA-256: a34019e0182603e112d010e4b4b894bdb911e3403687feee1573272c909d7df8
font_01_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 10752 bytes
SHA-256: 16f575704f602fa8c1a5f535fd9e0e0f115462007772eee26e9128e01871c02e
font_02_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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