Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad423ae8782aca1…

MALICIOUS

PDF

73.2 KB Created: 2021-10-20 05:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 18ced047ba170d36565c6b8fde541cca SHA-1: c517afb58f6719c4392c79993bbecf2cee18debb SHA-256: 6ad423ae8782aca11bd88a457758b4f8f8b459b45ac0b1450624b3ac04dbbcb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code, likely for further payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=three+phase+controlled+rectifier+pdf PDF link annotation
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/lisasabajikufuvepatojuka.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/lekutowova.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/limusevinupobi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616372648d5c8---68895202148.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c0e69e87f---nadotamoruji.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/451d3baf1fe64a58c384fc9acab03682/10451598472.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/59078534356.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/bawixakatapujirojulidom.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/rejabilewegeve.pdfIn PDF document text
    • https://gangnampools.com/contents/files/4758582033.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/71908948898.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/39566700061.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/32490585160.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce71d59da---18762060619.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613998caf2e78---joxobofuvewafe.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/vidunekewijibuli.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20211018_084525.pdfIn PDF document text
    • http://alvitraders.com/files/woxonalawonegajevelix.pdfIn PDF document text
    • https://computerzone.pk/file/puxunifokiraterukewazofex.pdfIn PDF document text
    • http://schokofontaene.de/idata/tukilumewagexem.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/64938476216.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_off0000bb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB70 10680 bytes
SHA-256: ea889f071981b1db6931ab35911f9b7c729867658e3a99b44f052bff2affda7d
font_01_sfnt_off0000d3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 16920 bytes
SHA-256: e00119a094fcb433bf3cdc3e6ef9aea24f03b5716713dc49432f7e83db6d0bb0

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