Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf07c497e70950f3…

MALICIOUS

PDF

92.1 KB Created: 2021-09-01 02:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a4cde11fdf134222de9cad4a6c65cc6 SHA-1: 71711e92535eefbd7a298ed9795d89b71f49e828 SHA-256: bf07c497e70950f3a2b2f8811e271f60e85a6659fe3370a78b72dd1809078ae0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. The primary goal appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7d0ed2b62---wedaxolorigurarabipuk.pdf
    • https://psychotherapie-coeppicus.ch/userfiles/files/nabibajuvunafufotijel.pdf
    • https://floridainvestment.cz/files/file/28212214336.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/a5bfc366de8a8dd829fb7ed278d5b993/fujopitagugimemimofonan.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b2d5878d---waketelajurik.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/bagevufofupolasi.pdf
    • http://www.jokilaaksonratsastajat.fi/file/16297417558.pdf
    • http://toroisg.com/public/images/files/93772043087.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8791703029d83cffdf148ba30ba40566/dinopade.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/xipuxoziravepege.pdf
    • http://phelieuviethung.vn/upload/files/jivozamivirumuj.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/053117425c62cea2bfcbd2e089aaa11d/xulibajufarepejule.pdf
    • http://eko-inwest.eu/upload/file/setebisotamixusiluxe.pdf
    • http://phantasos.org/userfiles/file/sizadop.pdf
    • http://eaas-journal.org/survey/userfiles/files/73916520206.pdf
    • https://ascinfratech.com/clientprojects/trading/file/bapemupavidevodakizekija.pdf
    • http://shijijiaming.net/filespath/files/20210804003506.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/rugemawawibisoseze.pdf
    • http://nuovartea.eu/userfiles/files/61448846666.pdf
    • https://anthonygillant.com/userfiles/file/lofawevukiretid.pdf
    • http://technoauto.jp/js/upload/files/xatewawibudafap.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609448a519462---nekitawatupadodud.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a133a67e51c---89766678317.pdf
    • http://mahnomenalumni.com/clients/879209/File/vejamaluwaligoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=answer+to+why+did+you+choose+this+university
    • 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_off000103a8.bin
62d2ea212d247d4e618362d02f740c3a6761eaf4c1c1d4fbc7cf5b2afa73a8fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 17724 bytes
font_01_sfnt_off0001313d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1313D 16792 bytes
font_02_sfnt_off00014954.bin
820dc2d699e1e9cae1f168797db291c8b48ea7b3284132c01125d2e4f52123cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14954 10604 bytes