Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e7e564dfe1e169…

MALICIOUS

PDF

93.3 KB Created: 2021-09-24 09:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e9404b5d5d15fe6c6e43612a724c03da SHA-1: 7e5a538bbc8941b69c80f6237dd5326796972b8b SHA-256: 98e7e564dfe1e169bcde90ebf62f79d172a3770454b317719773f0548e07fcb4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple external PDF files hosted on various domains, some of which are identified as compromised CMS upload storage. This suggests the PDF is designed to lure users into clicking links that lead to further malicious content or downloads, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • 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://normec-cm.com/ckfinder/userfiles/files/49936973728.pdf In PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/35332310328.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/xorufi.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/77234936180.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/94360552378.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/12866819951.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021092312544274.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109071101216385.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/36609794586.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/41614674857.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/11769316553.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b7e2eb2f---kokulibagopoxuzusad.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f446807a---xosinipifadegebasewafibu.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/96942967700.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109070656296930.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/sawozekunagebi.pdfIn PDF document text
    • http://livestocktool.com/d/files/96572352140.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12311771229.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149735d8dc41---47478925425.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/21649754064.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/47196323204.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/bitigexopibi.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/17270843407.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/82143356327.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/78814991421.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/36026443845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hoi4+win+war+commandPDF 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_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 10240 bytes
SHA-256: 8164f072be16b64adb443f5b7777e4949ba92900b0ae889207392a51ee75be42
font_01_sfnt_off00011fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 18028 bytes
SHA-256: dc0d9c2fb02d51472d86c43c884f3802eb6b097ea2ce685872925a4ea0c6f93c
font_02_sfnt_off00014f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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