Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0461234dd4c3033…

MALICIOUS

PDF

79.6 KB Created: 2021-09-24 09:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd929ddb8839a5ac4486d5c605a54833 SHA-1: e6e2bac3a53df23a311016a09435e196e1219ebd SHA-256: a0461234dd4c30337d6767a009df9be3ebd704b5663b81ad93dc0439652b1cc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised websites, suggesting it is designed to redirect users to malicious download sites. The heuristic firings indicate a link farm strategy, likely to distribute malware or phishing content, and ClamAV detection confirms its malicious nature. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=powerpoint+presentation+app+for+pc+free+download PDF link annotation
    • http://biosite.ru/images/news/file/bukowiluduvoxomanu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435131d5171---40034897532.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c76fd1f0951ce4aae9c6fd3160d4cbb2/fawilotezupaxedexevuti.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614118d92661a---87895115632.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/21181468283.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/wegoxatabawegapumasegi.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/10289270217.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109231550502363.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/mudilaxokareb.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/27726448273.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/51318521886.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c2b95555b252954e6bf7e69fdd37ce94/95629378312.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/xojetofupo.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/23699765075.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/tilixewezu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf6200e37---kubali.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/terudedozo.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/wujegimapar.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/savozukikonu.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/81760709873.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a0e32d27d553b3548499446d854d9842/giforaka.pdfIn PDF document text
    • https://grancom.by/upload/docs/xivijovek.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/58760596299.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://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_off0000d404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 17996 bytes
SHA-256: 612115ffb3da0b9977156849b6cb0690e2abe3f1bd4b983c352b39bbfcffefbe
font_02_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 10700 bytes
SHA-256: ec6513e3d9c4a10acfb339ce125e49701f3c143d0a1f25e574b732d26fd77238