Malicious PDF — malware analysis report

Static analysis result for SHA-256 817f59d368181055…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 05:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9222e1851d774960e305460e47f8d079 SHA-1: 1f309bed26036618fb0f735255acac5d879ea59d SHA-256: 817f59d368181055d1b2ce2d946ce5c54236cc6134defa2f5fb8103fea550616
156 Risk Score

Malware Insights

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

The file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nibrasimansch.com/userfiles/files/zimojivateb.pdf In PDF document text
    • http://kameleonhastanc.hu/files/file/92544895119.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805d4d1c60d---61786173056.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/zusugatusu.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/bibuware.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/luxipapabezuzo.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/85133789916.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ta61hadj614fv2jv5l09ibmbj5/73197753874.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/3m6v07jlv7ad3atl0vuvn5p7r6/vulexufidori.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d01f99b63df---9811625688.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/35dd7cbdcc16092ab17a849aec92318d/dixibasorifudiga.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/lln0lqjv4c8d63c98cmfiu6e86/44425482596.pdfIn PDF document text
    • http://szwygs.com/upload/maniveror.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/lexitaluzifexukata.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/27824661648.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/98437854525.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210809_B185E05E5A11B427.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/43470204039.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/xebolunuxitiwi.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118a94a3214e---64648815875.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tm6e01ft46csesm7cggehu0j8m/savuvebilavalelulojadotu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e4f2654b---9432751610.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a34bc2d5e1a080a809d2bf089f6323b4/xivifusuxukukuzug.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd695945497---xovelemebavivobuxafejivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=deadlock+recovery+in+operating+system+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_off0000b993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 11236 bytes
SHA-256: 074806c5f93a1bf42bdcc26dc286e6b46f7abf259197e59830828a76bb323d4d
font_02_sfnt_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 15436 bytes
SHA-256: dbdd08a487fef4d17205f1c0964ebdfef932648b5de67b457c1d239aff12f164

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