Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84b72bc744e1ae0…

MALICIOUS

PDF

92.8 KB Created: 2021-09-01 10:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1321249ac19e4b0d70e7a55bd2d09e4d SHA-1: 7430fabf8363a6316e0da88791e4f6a45f6ad818 SHA-256: c84b72bc744e1ae0418e48e9d375aeca55754db03fc21b649ba1bdfcfb3391aa
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5562f1291---luwadipidekakodavalot.pdf In PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/107g4qma3mqt092niikg99kehm/vasifewuw.pdfIn PDF document text
    • http://unsersohn.com/images/file/saworapajilale.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/vubikugekazujofiteb.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/mizafaxojugepidutuxadabez.pdfIn PDF document text
    • https://bagstyle.uz/images/file/42543955286.pdfIn PDF document text
    • http://bscartridge.com/pic/sisivexudigatuxexiz.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5560f1e12476f060bb5585a7debe1a43/rodoxuti.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/mebadofuzigube.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/79vmia49aaue4q42hif2vnfdv7/55520069384.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/4878urf9ad2g418juetf3r3uk1/14477649999.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2ba02682---losovaxe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a765b43e29---ridufejaduwu.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/21470988559.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/28484463167.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/kemawixawimutivaxaseju.pdfIn PDF document text
    • http://hainfelderteich.at/45719453667.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/38492599116.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/xubonuvab.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/josizisep.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/zavaniv.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/saxedusuxuvegowato.pdfIn PDF document text
    • http://charivne.info/images/file/fuzezorep.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c2e573f28---42095094603.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/suliwodubibugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=awesome+words+that+start+with+lPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 16932 bytes
SHA-256: e8ad94b186d0a5030a01d51093c00e62d20d6588ce595a11f35c48bc9722adf9
font_02_sfnt_off00014bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCD 10476 bytes
SHA-256: b2eacb4d82093d8d4e92d1ad260e0c82fa8883691244cf4a977b1d860814ec6e