Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34e32fa307fc6cf…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 01:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c45c65271dab0da6bff1099ba801be9 SHA-1: 5a70a9417ed09060875da8440eae45e0b5f7e935 SHA-256: c34e32fa307fc6cf3dcf05f29eb11dbf215b68d3cbe9b1249537176f526f36dc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://bjsprt.com/uploadfile/file///2021062021103252.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab02456792e---nererolileberuxalifumun.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c58dbb5e8---zabotafufuxaxax.pdf
    • https://tecnicadovolante.com/images/file/semujupito.pdf
    • https://aldurra.ly/images-editeur/img/file/tobilasonezogukoxenokesi.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54ed604107---xovurufatojukuje.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee171e6a446b0880205a6a11354c492c/19436266394.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0559ce84d---87777639743.pdf
    • https://svingenieria.cl/userfiles/file/lumevilatoximajuj.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/86112f9982077f946df6d63513cb1a46/5455168474.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/d369rm8sghgac3fse9mlit3ov0/nadepovab.pdf
    • http://tms-operation.com/upload/files/mozudagejidulodefiwudep.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2c41e2bdff838eece8d7880de082f319/31117990432.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a64fbba7c8a---51782596312.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qag8kn4purbnqm1d7mattd2fqc/wozukedevugavusibo.pdf
    • http://france-ex.com/images/blog//file/39607818322.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/tsblrhhhassfmebjudp29chdm5/kumorotiba.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a98244f24d2---wugiwakexojoridefe.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb662241b9---gimapekidanomanavavuzora.pdf
    • https://thechoose.it/file/dugeka.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8042fda120cd278fbf0a0abd1b20ac15/zuwajikasoxobafojobinaped.pdf
    • https://beytarimcilik.com/admin/editor_resim/file/38965339976.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d3811e6d---kopakafixa.pdf
    • http://adabaskimerkezi.com/upload/file/filavimavakufuzolodiz.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c70e4c4d20d---29322369743.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=wigging+me+out
    • 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_off0000eec3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 16792 bytes
font_01_sfnt_off000106d5.bin
d0d3c6704313a35813058008f8ec2c6b0df7484a31f9abd93087dac70489abe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 17608 bytes
font_02_sfnt_off000134fa.bin
60fcebf0e0ee68a839a8b0e0bd6a5de74eee904241d967eee2373b2bc3e75b09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134FA 10068 bytes

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