Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5455d5eeef0000…

MALICIOUS

PDF

83.3 KB Created: 2021-07-09 06:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 230414f1add9dc39baa8b5160b74ccc7 SHA-1: 698bc624a3009592195b26ea30efdb75fb40fa36 SHA-256: 2b5455d5eeef00005afb5acf952df6787c3ca751464f8c3e893ca74dbd08627f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://inwebjor.ru/uplcv?utm_term=old+baldy+lighthouse+facts
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/71111737bad7dc4b294bd66b18897949/38054929452.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/j5c9qv3f7mgj1lnn4qguem3mo2/genegisuxizopisu.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6f4686fcc64362695e2e1131d0813acb/kubaduv.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/vavodozevekikaxuvesatud.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/69253528089.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9da75e3d8---44531916535.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/273flc3jak48pdj76cd45dk9qt/86619139122.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c234afe831e---73935189314.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6596d4171132e3633a0562201b0f39c6/53225970952.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/81439807078.pdf
    • http://metaglas.kr/userData/board/file/47147235353.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaca9ea23---21535078338.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/png8kkg3b10hvg0q8cpgte9sbp/vozapokafuxe.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/12012329894.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b9be7a77e---46562908383.pdf
    • http://aps-mes.com/files/file/fefanelojowu.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607556f82f653---61171849500.pdf
    • http://nissanotogovap.com/uploads/images/files/renadibipezip.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a176271c758---72759604303.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5111aae72c42d5c2ce7ef2134de9b09/42331290568.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e81d32fbc32ec493f00a64dbc8d63bbe/wotaraz.pdf
    • http://zzweien.com/d/files/17152120758.pdf
    • https://pypconsultores.mx/userfiles/file/69194343350.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/66a5cbdb4b486f2fce40b36862ad7599/kolususivetexel.pdf
    • https://hotelmitrutarija.com/uploaded/files/laradilapojaxi.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9fafe5b1e06ae6e9a26e6ab949575095/70244966455.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 16792 bytes
font_01_sfnt_off0000f861.bin
acdb69aa03ccb8fb17a9033a61131f0bae27ede77e24deaed33733a887beb02a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 17528 bytes
font_02_sfnt_off00012692.bin
656bb40b4004b1a1bce9be29609db169340cfad3ed529be9b2aad6eeb92c5c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 10932 bytes

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