Malicious PDF — malware analysis report

Static analysis result for SHA-256 487857143a10ce5d…

MALICIOUS

PDF

86.8 KB Created: 2021-06-25 03:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 160458f32d8a9ccf4310822f49b1d725 SHA-1: decad1403665b37246607e8f9894fd71f48d5674 SHA-256: 487857143a10ce5d9b3961b2308d4aa533d0a89486794c36f042746cee5ca0a1
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and an ML classifier. It employs social engineering tactics, specifically a 'Browser Install Lure' to prompt users to install extensions or updates, and a 'Password Archive Lure' to conceal payloads. The document also contains numerous links to potentially compromised WordPress sites, suggesting a distribution mechanism for further malicious content. No scripts were extracted, but the presence of these lures and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ab4075f2ffeefd660ed6bd1e1e8e197a/62664737242.pdf In PDF document text
    • https://serviceservice.eu/userfiles/file/81699437752.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c28ad1cdc47---rapibax.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/531126ee14a128bd371eb693b1c11937/74427292339.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/klkdig9ua0mtgnt1uk9opa5r76/96156656877.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/fuwuxewevaludoragan.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/bapenijutoravetetuwitov.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c491162dba9c49d5be9d9029e2fe8c2f/40789467117.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/33833453513.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0b032dbb913f324c15fc7be45c423447/maverigene.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/29k5tpr7mp7jn47as9uke1ab3k/83673137014.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/noxuropelububu.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/lutakikupumekesi.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca10616fa---robadagukeraw.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fcdff0fd4---3015245959.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714d6d16a74---tizetas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pdf+oxford+booksPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001151d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 4932 bytes
SHA-256: 09fb580265f072592e7ae7b0d1a6a840f3f30fef7188dc118ca3013b78142483
font_01_sfnt_off000125fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 12028 bytes
SHA-256: 3348e0936b353e175b30201d4c45479f12ef67ebbf243921d96c5058b960d5cc

Open this report in the interactive analyzer, or submit your own file for analysis.