Malicious PDF — malware analysis report

Static analysis result for SHA-256 c240b50395f18889…

MALICIOUS

PDF

90.3 KB Created: 2021-09-13 06:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0bde0194606724f363fc5611827c0c56 SHA-1: dfdfd96327a5f41933c3172fe805a18c552b19ab SHA-256: c240b50395f18889d7f2ab0f4bce5a8496615d9021724ffbc2a83e6035a79965
204 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 WordPress upload storage. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser update or extension. This, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware delivery attempt. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lose-weight.tw/upload/files/wagexugubege.pdf In PDF document text
    • https://martan.es/cenavarra_userfiles/files/76413922720.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/kibadebaxi.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/xenolomijusuje.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/mogozobuduz.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/22538197301.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xemolur.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/44617065826.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161342ff824f31---22628900582.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/gotupaje.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cbe31c6f---29824526740.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/37634492853.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/96720859460.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/sekavebofamowebu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354241d5163---sijorijikuvivis.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/32120582259.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/64439653578.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/92321962046.pdfIn PDF document text
    • https://serka.com/serka/upload/files/jaresawozemugesop.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a27605f1a7---81549767244.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/mamorobifalusokojuten.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/21206228808.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/zudebikitavozolonukusix.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9d3232efb5c04daf942b2a8427e03619/jovafopajibox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cast+phone+camera+to+chromecastPDF 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_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 10532 bytes
SHA-256: 1acba87a386c6b93b4f614c1c4e7d720dcda95e89cd9a7364ee9fbb2335d6b8a
font_01_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A86 18984 bytes
SHA-256: 3ab238611c26d2a2b76c14729f373614700cb183ebaad13061c17902961653b0

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