Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45733c8d65deec0…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 21:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 694aca52ba2d47f53e7f8af717a61a40 SHA-1: 8c3b055bfec6eea57c2a8125a0d6123589d16841 SHA-256: c45733c8d65deec0182e094385448e8c827b74cc08223081d95d6c85a197fb40
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a high number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the extensive use of external links suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=physical+education+class+12+notes+pdf+2019 PDF link annotation
    • http://chayka-svg.ru/files/61937550036.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/xiwomisagerajamenuzo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4b864dac4ad3298b0cb479a7845fd6c2/kepisaxupewifanoji.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/26670677577.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160ab693e14c8c---rutaperugosesozudukas.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/padikoninu.pdfIn PDF document text
    • https://digireg.es/upload/lowavoputaluwir.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/xesojazemu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0364c9055---zunolojofow.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43ee43be5---ziwugew.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799311e7134---pevolixawuxevinazusufe.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/gefapijubuginixisiwaxo.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/43698175105.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/pifisenixojudi.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b346b0bb6b97cf29eb1ff23111f1cc25/13145278404.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/zeniw.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wuliveposalarebulazux.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720e0972ff8---17468622874.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b312064c6---55373835505.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-25/20210625231150650753.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/4iplrsgpuqsnf31mmaedtuti2a/65475740817.pdfIn PDF document text
    • https://asi-filter.pl/files/file/zuxiweb.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/havogajaok4ss3is02k8n10osu/78157971927.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_off0000b7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C6 11296 bytes
SHA-256: c8a119c00fd2092ef77335f5b6b8cdba3da2ca10f783f8ff29a81bdd7ee6f709
font_01_sfnt_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 15504 bytes
SHA-256: f3bd219a8d4458baf737209fcb1181718ea74235efe6be385168a3d9393dee1d
font_02_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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