Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbc009b324efd8e…

MALICIOUS

PDF

78.5 KB Created: 2021-08-29 16:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de9ca40c1aecafa7206dafa3b19a8985 SHA-1: 9659c2d14baa20b324b4f944d0c95ed1b28327f0 SHA-256: bbbc009b324efd8ef908a4b86af05fca2ae57a6dabe2f3aa05d89c68073c2333
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://cn-junsheng.com/upload/file///20216452754892.pdf In PDF document text
    • http://worthingtonpark101.com/userimages/baladurajeloz.pdfIn PDF document text
    • http://veitali.com/upload/files/34215066811.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505192345.pdfIn PDF document text
    • http://surtek.biz/image/files/20150201_195709.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d766be1eb3a476f5a180353348177865/fugexa.pdfIn PDF document text
    • https://digireg.sk/upload/kuxumiruraninumalibire.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3ff57cf13a0d470815a95d7a4b104221/25827135291.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c848c7f900---43880388260.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8882b1d1ea---62752681589.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5179ed61ca---37200507470.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/47153901939.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/bimutoradativawolazikejot.pdfIn PDF document text
    • http://kingnature.ru/files/files/88325246426.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202108160451537465.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160867447050cb---puravomu.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210720_AC65F8E049613964.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f2350cc6---10879196647.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/pixupasikule.pdfIn PDF document text
    • http://ciskmv.com/css/file/bubamokebe.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/zotesi.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38897768318.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/vafaguna.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/91980817673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=alphabetical+attributes+of+godPDF 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_off0000cea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA5 17372 bytes
SHA-256: 56c75ea0ab6f40e28c027c8bc7f4967a5dd0992314d8956ada3403ed39dd8be1
font_01_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 11016 bytes
SHA-256: e9407994d1f3000d5ddd23d36a9144c9350b919e59f8a774859bc974fcd0071d
font_02_sfnt_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.