Malicious PDF — malware analysis report

Static analysis result for SHA-256 c463a5ef25821168…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 00:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f26811ee0db181be87c3a915b8e910b SHA-1: ae6acc9e504813f8d1da0a1ca9cddc3d4fee32cb SHA-256: c463a5ef25821168a62acf7465619cb8ee6faac8a2eec8bd5ae4fc00ec7ec681
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Several heuristics indicate the PDF is part of a link farm, likely designed to redirect users to malicious sites or download further malware. The ClamAV detection and ML classifier strongly suggest malicious intent, with the embedded JavaScript likely responsible for initiating the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://isleo.com/i_photos/file/1479746893.pdf In PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/vaxalokunevutixelewuji.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/47c8bc82b90a28803b23adc8a9d6db58/bukogilumod.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093c6258a869---xizova.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/43512904289.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/63517082721.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/h707nq4v902centt5p29pslo98/80703711581.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7572ce0c---bixukilebunobif.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pkkn1s9mo1jdhct8lkf6dftg23/34142226711.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc09a368ba6---62042719830.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/pakasovofuduf.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/rididozufoxuvuzaweke.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611becca52736---lugesevipusazogazol.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/70793769081.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/kumamekopotamirugol.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/kawenubedo.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/lijelazivuwusok.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/wenesotewomoxetupapul.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/mamusuzolesepu.pdfIn PDF document text
    • https://wcdt.co.th/wp-cIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=solving+rational+equations+worksheet+easyPDF 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_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 18364 bytes
SHA-256: ac1d585db0fbf468aea57a666066288510d7401b9b720203c15d96ae12f1cc88
font_01_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 11068 bytes
SHA-256: 74143db476d67d2218dbf1139907d8f512b0fdc26d687942e8b679d7397040f8

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