Malicious PDF — malware analysis report

Static analysis result for SHA-256 d148c964da117d47…

MALICIOUS

PDF

97.6 KB Created: 2021-07-10 07:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03850521d203c89e8287b9c019d89b6e SHA-1: cc23d6e8e4bb62c27a069b2007f537ae1dc28d7a SHA-256: d148c964da117d472549ebf66eba0d553411307a9f5c69db54a3b1cb69f92132
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://ketchas.ru/uplcv?utm_term=best+chinese+lower+east+side
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be755c147e7---sezikiviwepaxage.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9a77714b---vomem.pdf
    • http://deryalvincotokurtarma.com/userfiles/file/23419661514.pdf
    • https://seikico.net/img-tym/files/lasolew.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608005ca0095a---zexipatubamusuvugevoxab.pdf
    • http://alwaditrading.com/userfiles/files/89286707873.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tsj0o41m5913p2l5o1f2qv83b7/kajulolitotod.pdf
    • http://webbuilders.com/files/file/rixeferab.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7959edd042954f8f684c4cdd315eea1f/losab.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d0c9fcb9---lokufipufenodazowavagosel.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/bfd197ed8f35ed312c79ab5c52a989e5/35906223172.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8bdc339cc---61495698021.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1a767371c---xunerimexodof.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8e965beb14faaaf7441b36b46c61311c/jakazemelabefete.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7046244258764d0a621fab138aa6d62/47657843305.pdf
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/31224843110.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe409bf292---61480162733.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16087057d99a8f---40084610084.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/janurijaxuve.pdf
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/norepapubu.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e681ac01f3c58b9c493589bce6956427/fimigutol.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/0b5580ce2a0ebf9102536a08c50df38c/ratupedoviwosofegutufasid.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/gubozajadakekedubuloxufu.pdf
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/letejokipujeponaw.pdf
    • https://jdlpartnerss.com/userfiles/file/razakotopijizawe.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/futf7juauqstrbtkfvo9l0k4p3/bipuzepiwakaru.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/27q452hqsnvpqh2s10rfh47ka6/nivuzemizitanevufufonot.pdf
    • https://havanic.com/cache/fck_files/file/35067899822.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_off00011867.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 16792 bytes
font_01_sfnt_off0001307e.bin
b3fd6187c63eb36d2cea263e42151c9a0ef1cf6876729eebc4c5fdd2fc65e658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1307E 10608 bytes
font_02_sfnt_off000148c1.bin
10c989e5bafad768ce2c329d3e94bb0c36f8b937a0a8d8a5379ea74bb65ba4aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148C1 18600 bytes

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