Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e11c86f1c74b03…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 15:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad26ad7a5c25605b439b242aa346bd2a SHA-1: 0be639a43265ff312b514c9b4d1a4fb25c17a92e SHA-256: 08e11c86f1c74b032e41ee60d0cd9b987a55cf9f4a73c5e23e122fc6e24b0a68
164 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 to malicious sites. Several heuristics indicate the PDF is part of a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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 https://huntic.ru/uplcv?utm_term=cara+save+foto+di+lightroom
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430df027226---38328390053.pdf
    • https://segurodegranizo.ar/noticias/fckeditor/file/8251243271.pdf
    • http://lammensfilip.be/uploads/files/bidobekare.pdf
    • http://to-kajihan.net/js/upload/files/48228799863.pdf
    • http://gavionescodeinsa.com/userfiles/pudatovuvesisefadikat.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136150e4036d---37846143204.pdf
    • http://sunnyten.net/userData/board/file/debumi.pdf
    • http://motopujcovnateplice.cz/userfiles/file/51107325339.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2u87t59d66mlsvqlcgu6hi0nag/15729682876.pdf
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/61696841610.pdf
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/58279052470.pdf
    • https://krzczonowice.pl/gfx/file/sevuneru.pdf
    • https://foulardfotografando.it/file/83784019482.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/72340715428.pdf
    • https://paklya.su/design/img/upload/file/84355227989.pdf
    • http://msslink.ru/userfiles/files/nizore.pdf
    • http://mabifitness.it/userfiles/files/bokeborusuravojosun.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/nunivu.pdf
    • http://zulassungsservice4you.de/bilder/file/74480484612.pdf
    • http://studiosantomauro.it/userfiles/files/jezuwifelexelupe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e261fa46---zawitoz.pdf
    • http://www.enredmail.com/templates/files/idCliente_/file/10489433960.pdf
    • http://www.peretprod.ro/content-images/file/sebujovagawewubezebega.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_off0000d9db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 16792 bytes
font_01_sfnt_off0000f1ed.bin
db965b5dd9a6b89bf6800394636840f77e053dc24f8a2cdf868bd5ae93b5870a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 17984 bytes
font_02_sfnt_off00012107.bin
b1d73e45621dec1c39be965b377a473a8d0b2da268b159ed041c6754f459c8ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 10792 bytes

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