Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78ff41e27205628…

MALICIOUS

PDF

67.3 KB Created: 2021-06-10 06:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: de35a76d0aa55f4bb3c5823cec14a080 SHA-1: 27a2c5d7bb7c7e519dcc12475316f331fd63f1a2 SHA-256: c78ff41e27205628baffc314dfa7dea3a949c5090ac8aa6bed150397785f613e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://inwebjor.ru/uplcv?utm_term=sherlock+holmes+a+game+of+shadows+tamilyogi PDF link annotation
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6882ab67---rilasosatare.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095ee9eace5b---kiresuxerizeregoborafe.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ovfs841ff5hbsu4egf986nbe14/53895029872.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6cf459444---gurikugopulobaritoragomez.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/67b24d4a0401e47a7499e4456c1a8078/faposaw.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/22256268377.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081c9111d6e2---dizevuvema.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/248e04128372b3dbc48df472673c5631/rixegizom.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d12cd4849---pudiworetodotexoguden.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28e72f16e---22762413738.pdfIn PDF document text
    • https://aspirans.com/files/file/78650478052.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/50813746850.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/a83d616c06de1b957dd08479bdf82d16/26540292350.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abdac078227---11483456584.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7627bd18f1921e0f4b3adffb4fb3e41a/1424895396.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/wiletibajekufex.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609251f8118d9---13705076446.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC948 5796 bytes
SHA-256: 8f7588104c8378078ebdf32f5babf2fc325d0977881d4be4262eaa0795dd022f
font_01_sfnt_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 10172 bytes
SHA-256: c51ea033b7572041922cd71e80296ffd186bcd4845a3b99260c8a605cdf55a9b