Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadad42d0ad931a6…

MALICIOUS

PDF

77.1 KB Created: 2021-08-11 00:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 639cd61694d7a5cff042bab56c0d6242 SHA-1: 00e14e62d5216d6a773769746ea8297a9a374b8b SHA-256: dadad42d0ad931a62bd4ff83665b626a0196d9a0db7479698de8a47dc1690d42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. These links are likely used to distribute further malicious content or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/m55k29af3crsaod4rfit3br2n5/50524844658.pdf In PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/85952172240.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8a745b1b5---xizaruvabire.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/muxilofemefokewidizuki.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/zalatebaregebebu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/j0ps9unnnkv4ritm8llhg6bv96/65408247371.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/s583t3piqni90pbsmr6r5c4rtk/livudedutotexolawoni.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vcmu86u22p671fn42aml2equpe/raxuloregamupod.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e6a6d47f9---liwexagilulip.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a61b1479978c3c96c6273c8937a80a8c/waraxak.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba3404bfb---madoloso.pdfIn PDF document text
    • http://hanleyresources.com/images/48804605463.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/kavilup.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f314dc1e60---87517051985.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d072a7e7a92---nemarofusijin.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/musijimor.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/dotez.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/7990751d77deec7b242b8e221e41aca3/jujuluvuba.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa771043eea---jaxeganonegud.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/parisisesebidigafojivexej.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/mepexomosafetinitike.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/30209361357.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/eb8661d59d71aadfa352daaa6c996d24/pomoperere.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/11684898368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=swiftui+by+tutorials+pdf+free+downloadPDF 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_off0000c856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 11004 bytes
SHA-256: 4d19eb71e1c9c82f76cf73f7f0ac62b77e84409bd8425d04c259f9336615af9d
font_02_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 16720 bytes
SHA-256: 3cf1ac46cffcde3f98d8e2c06d5bf4eddf584325320a3878ab2ce4892b6e6a91