Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e5b63cfb5327e7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 18:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 493248745f67b0b1376f2cfa29ce123c SHA-1: d9e969396d726918a8546b4cd557b3201d83d98d SHA-256: 99e5b63cfb5327e7161fd4d017e61625450a4db7a3b4245a6e49b8aadda5c723
204 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The embedded JavaScript and numerous external links, including those pointing to compromised CMS uploads and disposable hosting, suggest an attempt to redirect users to malicious sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser update or extension, a common social engineering technique to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://medvor.ru/uplcv?utm_term=how+to+share+a+file+from+phone+to+laptop PDF link annotation
    • http://theartofdesign.nl/ckfinder/userfiles/files/35712532259.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/10601882641.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109051113253453.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/65804866288.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/77732884805.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/22439116264.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/49629216255.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/76499955771.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/relodozavij.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/30046177840.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/kugumisilibibidujawo.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/safasejowasedarozilisam.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16145d724a5506---desatesewi.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/nojowalud.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/nuferarowunofama.pdfIn PDF document text
    • http://fabtur.ru/upload/files/24809408722.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/59719406516.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/63380987389.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368184de528---wazapobivawegefotoxus.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7lm8li119sbufnbnpo8jv1vvme/livilogo.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/72716243208.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/xorimomexomamuvuxi.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_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 17852 bytes
SHA-256: 9778625907409318c0984413e3deeb289af5def434519295e77b7b0159d83b57
font_01_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 10700 bytes
SHA-256: d5fe7b855a1716e25a3873d62c19e97791a75750c8fa09fcc9e3133af07776a3
font_02_sfnt_off00011796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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