Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9ab5b9efebfc98…

MALICIOUS

PDF

80.2 KB Created: 2021-08-29 23:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c818076fe5f6522f9d44b47bf74c36b SHA-1: 7f0d837c6d462b92c70ba82628559ca8bf59d3dd SHA-256: fc9ab5b9efebfc98de96f7b91056073d290b4d12faf836c079a6afdf3b5e085c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to host phishing pages or distribute malware. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for further exploitation in PDF documents. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=unity+post+processing+2019 PDF link annotation
    • https://bataretak.com/img/files/file/25952527355.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/kijiluvajovi.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/xiverejivedalizasutar.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ep8qsm4vm3qa0vefdfv6kn99fb/48749692314.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f27e59c2b---26501786898.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/elgpm7ru4as79ea96ct39hj720/kobopuniwoti.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/xobabapemesovirefoduteziw.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zusubajopetu.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/nubefilipiwoz.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/46001083439.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/58520595a5149d3d7cf6064e6ab3f0db/40418165147.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/sedozix.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/todeko.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/613fd6e598a3c257f71324424987f956/53244457874.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/2998100350.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f071eac5---60509566587.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/78966925084.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/32123314274.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608723f62cb17---10470789467.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/wigetel.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a09b7ff1e---bokanurobubog.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076c324a5733---pagateziguguben.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/19628179275.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f85ce4ec9f0---mubokevez.pdfIn PDF document text
    • 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_off0000d24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 10924 bytes
SHA-256: 6579c68e31bd3c647e7e2e18eb5dc6915a9101eb4afa9b4cde9fc7e9213d0184
font_02_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 18056 bytes
SHA-256: 5a364d8422ecc009e4833a65bec7f09c3e2ee5f6e129be961ab89d2550d4ff2e