Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a07994905f3692…

MALICIOUS

PDF

100.8 KB Created: 2021-09-06 02:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5beb76bb6e42ab9d2d0546678e661c26 SHA-1: f288e042ef24b4d2e9d023ce7561774e3090d8b3 SHA-256: 08a07994905f369287ed9c5ad59d4b67e54825f18dfe1ddd4adf7eda49cbab59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3da2e4b6901ad039fc368da561c15b07/44886883205.pdf In PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/0066a3f8647eb7c939fa0187103bd1de/52291604057.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db2261bc23---29611419853.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092784db81e2---gavomakexevaviv.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34df5fc37---zorawurejudimulexo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/cd7f786e722cfebebbd5a1df9837be9a/ganibenokonetefuseves.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/zetawevalejigivubinok.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b214c4cee45---tabapetit.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/8fafa7b1a47fae54e0d465bc85dcf09e/43010650895.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/17720342826.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16121a15e4dd24---gilasa.pdfIn PDF document text
    • http://kotolantopeni.cz/file/pereseravonut.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/bukazasavirodorivufavebak.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/19863057827.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/majepufobavusarixaxim.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aa60478e2---89455855493.pdfIn PDF document text
    • http://tms-operation.com/upload/files/melabikokajujeluk.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/jeworaburemuz.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/13290989478.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/piviviluso.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e9efe150fad792ddd292d92e14e7ae15/gakuxererawutodawokutox.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d4884783---48742171374.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/cba3iag75chn0edm848rkos70a/233341847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=los+precursores+de+la+criminologia+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_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 19744 bytes
SHA-256: c05dcbfeb2c572df9889e81999f6592f8e13615570c9a007b38c6549cf46544a
font_01_sfnt_off00015281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A98 10924 bytes
SHA-256: 4cfd8bd7f0f6e4e017c96a0e5203672b23e8d63abe401ee9c8e8375f7653795a

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