Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cd9930a5877bf6…

MALICIOUS

PDF

89.6 KB Created: 2021-09-05 13:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9cffc4b74ca7e3d41f05e20f09593ca SHA-1: b4eabf133ab64218d88850cc673a8bb08a332485 SHA-256: f9cd9930a5877bf6d3d3a8c1a4c43b690c821b56301c25942b4a824fcb6ef5c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to compromised CMS uploads, suggesting it's designed to host and distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via a link farm. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac265cf699---misabis.pdf In PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2a2a5dd41c966c153c7b1b71c05f18a0/nezes.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/mozetavamapujupamur.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/29662218890.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/74c6d59ede7a25a05c7e69db6d36ed53/zilamujoben.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/48493399976.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f050823ee86---nifizedojo.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25474cf688---79480290789.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rjvfga6uhamjrikqt6nhuiq5u8/50605135845.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fade724390e892e1c0f933e158c1098e/fitazipebiparukukojorere.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/48117277484.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/66512360595.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/21117064861.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/73830e422f385b31c35845b828cf13c5/zimede.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/volopamuvu.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/majenoreli.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210713_203327.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071d438b743d---23724041439.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/65746289680.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/18535538224.pdfIn PDF document text
    • https://appfacile.it/file/93707822305.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/giwijex.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/sevekixuvu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c500a86af8---70651840803.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3590cd71043378ef32b295f48eda9b16/fegebubezo.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/zozugilaxotimireni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=capit%C3%A3es+de+areia+pdf+download+gratisPDF 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_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 11056 bytes
SHA-256: fc8bc7117834e72424d9632209eef32eeb38f35b713b9542a10378ed74e016d2
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 21720 bytes
SHA-256: c9f116f7799cbb7e2d4fb82557b216b2d7f568c8bd352a8b9e1656f8e946c91b
font_02_sfnt_off00013e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1