Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ad3c1cf0bddd31…

MALICIOUS

PDF

79.0 KB Created: 2021-08-25 17:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6179d68f964f77b69fe2aea084ad9732 SHA-1: 7e9e8e811ce5ffeaf05492a2bf7c86dfd8b3d381 SHA-256: 26ad3c1cf0bddd319b85b775a772eb31fa479dbcd1e18089550584d8dea0df06
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous other PDF files hosted on compromised websites and disposable domains. The presence of multiple external URIs and link farm heuristics suggests a malicious intent, likely for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://aldurra.ly/images-editeur/img/file/sidadajoviwedoxudomisux.pdf In PDF document text
    • http://graficaeformazione.it/userfiles/file/27626470761.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/47774416725.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105080122533946.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ffe65f345ed---3873104632.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/15e6f9bdc7fbc90a003ae6576fb7547b/29823392180.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/pipivikasevul.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/85571593714.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/fepojizejaputadex.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608828c2d1b40---955750373.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744bb45418a---gojegagewalowuz.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/63967072935.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1cee2f73577f3fd59a4cd85b7a7b4bce/degipejigugejubuwebaveju.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/kipogutulujir.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/kedasegafevofemuvew.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/gamepatusovesum.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e35c6f77599---91853868114.pdfIn PDF document text
    • http://888chji.com/userfiles/files/56266193744.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaad5d8e921---komoduguwadekaj.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/72264134772.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/wupusorodum.pdfIn PDF document text
    • http://www.puhito.hu/uploads/jovixire.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607800025c334---14186343328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=8th+government+science+bookPDF 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_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 10876 bytes
SHA-256: b4ad6b661780e6e53a32b11e50bdc381a9523662fd6294f2bd063557746e0aed
font_01_sfnt_off0000e6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B4 19056 bytes
SHA-256: 056cdf14d5dcc90098db4e8cf08b3aa5dd0ba2ca1dd31f2df9974f7ac67a20d3
font_02_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1