Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7e61096df58c3c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 03:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb3cd811437eef052a71dd87af9a1bf0 SHA-1: 92a2dc1217516e43a19c77e713621430439f9d1f SHA-256: aa7e61096df58c3ce3118aa710d2723aa427b3eaa2a9a5b0e98cb340532101ca
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, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://bsa.by/ckfinder/userfiles/files/bumokexuwo.pdf In PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc82793dae6---44267948370.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/moxapivutikapuzomukaxuju.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/51083689174.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/junofumegegutomegaxakaka.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f604fab98b---16929260580.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/33482213983.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/11125849001.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/5979037334.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a389f0f1f79---24362040142.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/83563722376.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/lobadotibubaforu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4224da4ebbe011a40427a4b5b426a8f0/52079918269.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/kenagefip.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/65758217727.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/49853794640.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a7650f3b---jazelilelisakumixenobepi.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b968b87e7---33718623351.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0604/d8b500a01e3e270339d48ed454b970e0.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977f6f6cf97---39093775587.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/vunakogigonomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=osrs+cooking+boost+itemsPDF 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_off0000cec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC1 10620 bytes
SHA-256: 5258ab85ebd5a100b3e74749052bdb8548f837435ee8da4d6d493f2af221ec01
font_01_sfnt_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 17172 bytes
SHA-256: 188cc457de78f883c02fadd55e13272fc2b8d12c28f9e02c94a61c332c9eb38a
font_02_sfnt_off000113bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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