Malicious PDF — malware analysis report

Static analysis result for SHA-256 c836b81aba52a47b…

MALICIOUS

PDF

94.2 KB Created: 2021-07-17 06:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5938f73a0f5f2f291840e76b7f9a2da SHA-1: 79fdf7c59d31ad6edb3b974b8ab9f6842d71173f SHA-256: c836b81aba52a47b8781764810df5964d159efa7bdc168075e993ca95ca9837d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious files. The presence of a fake invoice lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often employ JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a533a1d79ee---kusilomibigajazizap.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160748054763a9---lisojukalogisopedetadama.pdf
    • http://amuseonline.com/absite/userfiles/file/daxezasoxevapip.pdf
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/48944808567.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078a123de024---karubimaxolozisigizabe.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16070abc4e9488---35095238921.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/edd73c0cc59e710cdc22f216d7ab3ee6/kiwimogatenisopipigefaz.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9cefc39cb---99114115125.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a303aced991---funajujugopezivifexake.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba06b3b43b2---19106870049.pdf
    • https://thehero88vip.com/ckfinder/images_store/files/betodov.pdf
    • http://files.ibiza-ferien.de/file/taxusinulibaz.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6bb72d86d---97783517397.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/mojomudisefevolufigivuv.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f11526bc86---zidunofotamunu.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/fc07a1d12f33a89e418124781bad7b63/losuputux.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607622c16e36e---bupipobanokefegala.pdf
    • http://clinicaveterinariasangiacomo.it/userfiles/files/88245059253.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608517b2488d5---lopodorejam.pdf
    • http://tsg-edinstvo.ru/userfiles/file/dabulukovisugaxakudatomav.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/65506726098.pdf
    • http://stylekd.ru/files/rapebakuvadosufereweg.pdf
    • https://mamotato.ro/userfiles/file/zudinunepujegoxinelupe.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a230b23afaa---tusani.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=please+find+my+attached+resume+for+your+reference
    • 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_off00010924.bin
a4ea5d320b946ca2d5b7c2c184cb7a83ecd53883a3853cb22ab53dea3ebdb106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 10956 bytes
font_01_sfnt_off00012264.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12264 16792 bytes
font_02_sfnt_off00013a76.bin
179a8b986e822b97ddc9a3217dcd6e287f488caa84da3ed4dce5ad1e3c1ab5d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A76 18600 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.