Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf66becb336be57…

MALICIOUS

PDF

78.2 KB Created: 2021-08-03 12:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae9cba04b629825e29995312331a8c38 SHA-1: f69eb7102700fa4b0b67e05d1b86daa7d1b65466 SHA-256: dbf66becb336be57476a0c15739247203b1498ca53b63f71876151a48275199b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, containing numerous external URIs pointing to compromised WordPress upload storage and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=exercice+adverbe+cm2+%C3%A0+imprimer
    • http://xaydunghoangthanh.com/img_duhoc/files/47614921931.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/36ae53101abd66db2743410330354c8a/sogeluxiwolo.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2n3c5723o21og6ds4rit72qdi4/xolidopawarivugugotuwed.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1170065973609fa796d0c7c.pdf
    • https://birotex.rs/images/files/widovomo.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31bc3902e8---78215916527.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1d78993435ba742bc4ce8460a194932/pekivabexazibisebufoset.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075acba87a53---dixovul.pdf
    • https://casabresciani.it/uploads/file/pogod.pdf
    • http://www.gesas.it/media/mailinglist/file/sogivisekapedi.pdf
    • http://chataphan.com/file_media/file_image/file/28505444756.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ad7961728---29097998444.pdf
    • https://ap-qatar.com/userfiles/files/pevadilapopipexujo.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b431dea43eb---xebunuwom.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160925cd134437---79313925531.pdf
    • http://519pf.com/userfiles/files/dowodidusefapexozakosapek.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-15/20210515033749293019.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b6d7ccc7a---19785686544.pdf
    • https://arzhosting.com/calisma2/files/uploads/mekemixivufemusotukakite.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc13ba45f9---sasamerifoxe.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/16220627472.pdf
    • http://westernmaki.com/uploads/files/45323283494.pdf
    • http://gpkoaee.ru/ckfinder/userfiles/files/49692205159.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/gtcivqbpeqk72dq2n26ptdr9k5/wonajo.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d8cf472d7---vizasufepawixigixurebu.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_off0000cb3b.bin
bd48272b53340b44392b5fbf7445eb33f7c2513bd4f36d85fb9e5413f69f4b52
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 18484 bytes
font_01_sfnt_off0000f938.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 16792 bytes
font_02_sfnt_off0001114f.bin
18be534a8d45f095c029e4109c62e638638657f753c9c0911c68ee6ba421090c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 10736 bytes