Malicious PDF — malware analysis report

Static analysis result for SHA-256 334102874392ef9b…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 02:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19b9e7ec3f611057e5e0319d5fa17c94 SHA-1: 3558653a5fcc3262292285975e3373302c25b8f0 SHA-256: 334102874392ef9b7cf23de22871d389d093dc91c158e2fcf428adc3055383e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smidgel.ru/uplcv?utm_term=impressionism+light+and+shadow
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/h7r2mfsqrb7n1ef0nduuhn475h/49439736550.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78bff97a75---35823185010.pdf
    • https://tahubunting1.com/contents//files/nawolotomonexuporug.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/fd4e4a013ae765ff8cbd0489d277ee85/nojizitamoregon.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5g5e2gjvj208n63vkfh5vhc731/2927219110.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/ea90a95f35466059c887515ef15ca32f/xuluwowulowoxolinuv.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c23a19d4---8563878016.pdf
    • http://sys-svinding.dk/userfiles/file/ferebewozizimofit.pdf
    • https://akproauto.net/nbloom/fckuploads/file/gigufuxeso.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609724332409c---suzoxolokapugowa.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1032381e---dagajome.pdf
    • http://crosswaysrecruitment.com/userfiles/file/nidonerunexudifa.pdf
    • https://annjulieskarpmo.com/userfiles/file/39364900505.pdf
    • http://growlink.biz/userfiles/file/vagemamug.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ffaf3ba2b2251913fa775d5412a48073/mufalusawulox.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/13679123868.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/s528vdlei3cqjsur32s9g9mkvi/risidivadopilibivos.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/bb0331c38e07e4279a29819ff41efcf1/nitamavufiwifobede.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080630873477---gasoxufera.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081322ea25aa---biwopasid.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaae11c5ff---batagu.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0bc1f335e1bcc8282e35c2f8ed5c89ea/20743954935.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68dfb7b1f---46385306249.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc13e95780---mamurimetowu.pdf
    • https://securitydm.rs/slicice/file/21009204540.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607755fb4bccd---11948225618.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_off0000f3d2.bin
907c475828b9103e47dad0669a18d43bd8e471ab9509f1a6f4747017a639fdc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 17768 bytes
font_01_sfnt_off000120a8.bin
4b9aa0ecea2ca05c5a9b2a7d595fe9c2b6f6eb1d31e5aab0682e748f0b182b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A8 10876 bytes
font_02_sfnt_off00013963.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13963 16792 bytes

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