Malicious PDF — malware analysis report

Static analysis result for SHA-256 266c9c85d5ce9e6d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 15:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24a8897595a0b867ab07af0e51b5c93c SHA-1: 077b534c09241646a9b7fcf118b558cde256966c SHA-256: 266c9c85d5ce9e6dec8c5fb5080a155b71f0285c1e1b9d6e247a4fa115a086c4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The numerous external URIs, many hosted on compromised or disposable domains, suggest a link farm designed to obscure the ultimate destination. The ML classifier strongly indicates malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6fb670d72---vagaxevanid.pdf In PDF document text
    • https://kermanrooz.com/img/files/rubazuvinusipef.pdfIn PDF document text
    • http://chapelguild.com/images/usr/48096106219.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfbd4cbbea---tuzomajatarokunofodamasaz.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/96399354688.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/40602807797.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/mowibizasejasijifaxuv.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/32284122791.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/79865360729.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/93613166693.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/goguvaseputaxikediwowalik.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607629c82a571---47233748858.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0c06c25621282ea1a55a8c2bd51464d0/27653277401.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/1064847501.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/65495014439.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/cf19e75f66943fead53c043ba700e80a/guwatalosozu.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/zuzozeruxexumexopigububil.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/5167818644.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/43413927583.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/4512884113.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/851fa6d75284dd92befe68456c8aa128/4524290880.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/k0pe9oku96sr7o2b217bqdvn49/16523250885.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/763ec9bc77f54d76ae3e9dba91807fe8/xulabadubaluxeravul.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0fa54709b7c5d43856283985b4ea6ccf/volefujenito.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f1230e87---judixebonozuvegobinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gimp+manual+pdf+2019PDF 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_off0000d04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04B 17440 bytes
SHA-256: 6078bf729d90168eca32b76c95564d61681961b86f85811a2ca6ddf977fafbf8
font_01_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 10644 bytes
SHA-256: 47ec52fa703533fd47d0870058b4e70ce247ac908ef4ab8d48345523f218bba6
font_02_sfnt_off00011611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1