Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8e32bfa1667cfe…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 09:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 548608050236837ce5acc1b02c8950ab SHA-1: f9df378804a3e67e2b3abbaae9b973db871df610 SHA-256: 9d8e32bfa1667cfe6254ec642c014c7e0b93aab9b1b9c2e42d47ae46f06ebf0e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking any user-readable content that would indicate a legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/835c3e7bfe7ee5de134ed1289b1d0308/seduritejabowimixuroki.pdf In PDF document text
    • http://laserinnsbruck.com/static/12928368139.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/pigopiv.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/tusugamobi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405c71d4ccd---wisixosi.pdfIn PDF document text
    • https://flomogroup.com/upload/files/57881864058.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/mapexudexen.pdfIn PDF document text
    • https://linker.tw/files/61516065415.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132d2fa7e3d3---22804901796.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8d6ab5cc---32544488295.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/dememuzejizodedi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/bdd4b4a1cb589ec491d12206a033285f/42371029724.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a46b500a6---puvuvidizefivivito.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/71381627491.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/58401088108.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/mijakivotowejurododopesi.pdfIn PDF document text
    • https://bataretak.com/img/files/file/41557294517.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/82159386997.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ac5f9564c93b51780655b3c88d876e9d/70677568961.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131b707d5852---vofuxofas.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109098593_169967208.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/nirajufakezulufisisaw.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/poporanujiwinuralobufasar.pdfIn PDF document text
    • https://bliznacite.com/files/zoxexodutenipiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=descargar+super+bomberman+2+para+androidPDF 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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 11076 bytes
SHA-256: 6d087c9f80d56891a12bb0c7f72a819df70195840c5d688eb0ac5a4934bd04db
font_02_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 18956 bytes
SHA-256: e42e52e1a24d8a209d9b661f80828fb9ce1a2ed53bb39825a86dd909cbe98e6b