Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d184de29ccd9111…

MALICIOUS

PDF

75.1 KB Created: 2021-06-13 05:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b3c14ad6d0f1b07afe167e92805c35e3 SHA-1: bfa42a1696a8d641d7fa08b7a75fa4cba8b46bb0 SHA-256: 8d184de29ccd9111607eb6c36680857b6c2aaef5b5ae0ad360de60faa8ad0be8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=mein+samjha+tha+tum+ho PDF link annotation
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3f729afc0135ab35bef1d004f9136bc6/dapubomumijo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160726ce06f532---nitizunupuludo.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/nenajifeb.pdfIn PDF document text
    • https://airbays.com/userfiles/file/sidojifiruwubaluriwa.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9d3eabf3---domiganenakezogodi.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/62463318196.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/dc5867f23b39619922b2caeed218f8f4/kifadosisogijun.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca90be2932---tununutenafanozovanevepi.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105030918105629.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/37734795547.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafdcb4e7b4---welaxiwurewosinejikejowa.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/30deb34071bff5ed517e1de551a2db52/pumasusezorideleb.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/lelifavazenufarikolu.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/begolupogo.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/17e67aa3ad5bad3faa737ecfeff4bffb/49475573390.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/76969482088.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160703df4a8b1d---femurukomerupebu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0379698d04---parufuwobo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 4760 bytes
SHA-256: 7ec0ba118546c0e9b9ade94ea8eae50f6fab6584d6022139861b63110c1eb40d
font_01_sfnt_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 10192 bytes
SHA-256: f0ba5b21269e616a92a50fb8b6ef1ffdcccfe69beaf43e56dfe1bb5a7fb9db93
font_02_sfnt_off0001118a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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