Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae59026ef8e21e8f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 04:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25faa700bd661d396ff67120972a2667 SHA-1: df61f47a7c7e64b1787874629609d322426b65d5 SHA-256: ae59026ef8e21e8f232b6106b31a9db0fcb1b082d332e2e5dfa85e4bf852cd17
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and presents a lure to install a browser extension or update, a common tactic for credential theft or malware delivery. The document body is heavily obfuscated, but heuristic analysis indicates it is part of a link farm pointing to potentially compromised WordPress sites, suggesting an attempt to host malicious payloads or phishing pages. The presence of embedded JavaScript and the browser extension lure strongly suggest an intent to execute further malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://akademia-jedenastka.pl/zdjecia/fck/file/97320131127.pdf In PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/6368257544.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140900574115---20433667475.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/85303302360.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/xagiwulomedizevawesutuso.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/61707364318.pdfIn PDF document text
    • http://clerus.hu/files/file/fazowusutaru.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3b6e0129769f6df274947bba50f40e99/wimezisokajubof.pdfIn PDF document text
    • https://desco.scp.hr/files/82261638718.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/71c1479f39e4b6bab372991bd74b1fff/86283467838.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/45637701170.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/39587680575.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/85446458571.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/sulubikoratebubawewoxafav.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/vizajutulipajojanul.pdfIn PDF document text
    • https://foulardfotografando.it/file/87512540161.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/rogur.pdfIn PDF document text
    • https://phr4u.com/files/piduni.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/budugibimirimogup.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/riwuk.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/31842142789.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c2841db1a8081c1f97cae9922042bae6/52775706720.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/92661315364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+dark+mode+extensionsPDF 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_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 10608 bytes
SHA-256: ffb4e5e7d1d2fc8e302085ef15644a1b367d9c633764d6838876b57afe0820ff
font_01_sfnt_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 19100 bytes
SHA-256: fb7532731c9479718ab5486d19aef3a5d7be15a60f7aae0c1a561e6418169283

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