Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f730f7f3ecd726…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 18:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d6b05a0a6a3753f32d5b9f7c9dfd905 SHA-1: 4157a8c29fba57a610fbe556b6be1bdc8e4ebc66 SHA-256: f9f730f7f3ecd7263ec0110e36c2624ded50a2b4787b188d8104722956ef730a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall structure suggest an attempt to lure victims to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/996cc781f53e61df88f010544f5e5cf0/lawimunajofib.pdf In PDF document text
    • http://vekosgroup.ru/userfiles/file/najonelofamitixeliwovo.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/pekepegopanunojiroxur.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/netanafuvezises.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/35391328516.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/19955994734.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202108230216425526.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/girenizefaxozizimarezediz.pdfIn PDF document text
    • http://foodchemsino.com/d/files/resela.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/4e121954718990bd6b5d59b15d2b0ea9/55102545773.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16085827aa1333---18397743939.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7e34d171---zubikigasax.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/jujanupezudakonokobopip.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/mefetinavunakagixi.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/54836449017.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/84667326050.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f3322a307---dovizapebulo.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/74712341233.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8a14f209f---34497884989.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd501e9f8---kelisul.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/bapirakimovimiterize.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d141ee0fa---fodabasep.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/dijodusija.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/17038690247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ceresit+cr+90+pdfPDF 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_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 18044 bytes
SHA-256: 6d9f394533162487e03bfa37b30a3e20600631a4978f64960eafddcc8efa7365
font_01_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 10504 bytes
SHA-256: 26dff1d538a3c34e552276c863f1782fc29dbd23a58d384c19123c341f591e8f