Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd7208c776639ea…

MALICIOUS

PDF

94.5 KB Created: 2021-09-22 12:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cccc063a3ef8871f696f86bfbb3cd319 SHA-1: 5f96db10ba89f7d414ddc460566ae8d0d67ea6b1 SHA-256: 9fd7208c776639eabb01ccb057d1fcb75d0e3f664b8f8bca5bb18e1f5e8eb50f
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS uploads and disposable hosting, indicating a malicious intent to distribute further payloads. The presence of a 'Browser extension / update installation lure' heuristic strongly suggests a social engineering tactic to trick the user into downloading and executing a malicious file, likely a Trojan as detected by ClamAV.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://halongbaycruises.org/upload/files/bizisoz.pdf In PDF document text
    • https://agri-mal.pl/userfiles/file/29922603239.pdfIn PDF document text
    • https://network-italia.it/file/85762941415.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/vitunure.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/kodepozazaginizonos.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/18390571499.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/64833187295.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/radezukomiva.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/6746444551.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/65675419865.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pitinofab.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/61260469688.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/65133429353.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/83395261354.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/68728461122.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614685fd2c322---xawifigoronuvininilufajo.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210902154345_2107231462.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/peparisewumegagodegeliven.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/kolazozawowevemawaf.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161361e0d767d3---mepuvakejovawozura.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/78123c73459aac1e3c3dd154b3941ab0/volovuzefajuzaje.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/degetiralipipemopabeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mastering+pytorch+pdfPDF 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_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 10960 bytes
SHA-256: 8481ae752781ab5ae2441b7f9f0b7519a42898b1218a6016eaf76cda98d26407
font_01_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A29 19528 bytes
SHA-256: d20408ff564be88e3c807151b38528030c8166f19205baf5b372981ca3528ec5

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