Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e06ea6b438a6ec…

MALICIOUS

PDF

87.0 KB Created: 2021-09-15 12:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2e5e8b0f9743d88eef566905ef6a03a SHA-1: dc25bf2bade172a40fa7235d2e3587095c874ddc SHA-256: a4e06ea6b438a6ecae21406f0080d0c1ca2ca5b3c23278b1ae3cf518b893972c
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing malicious browser extensions or updates. The presence of numerous external links, many pointing to disposable hosting or compromised CMS uploads, further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://wxdyzs.com/userfiles/files/2225435478.pdf In PDF document text
    • http://tns-china.cn/editor_upload_image/file/tiwane.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/pasubas.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/kolej.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/46810159393.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161401b7c5317b---16810501579.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/59911696627.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/etsf9fgutru12re2lcrk7rniup/16992613294.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/95207722528.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/rurigowilokotiwuzopirilul.pdfIn PDF document text
    • https://architektor.ru/uploads/file/dikexizimidoratud.pdfIn PDF document text
    • http://shahgrp.com/uploads/tikin.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/kusuvaramurosukasijije.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/zimazipi.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/miberigabodenebepidefaj.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/65868838726.pdfIn PDF document text
    • http://homeopathyhk.com/files/wigerelobolajinexamafos.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/tapamozubezutamilidasuxas.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/cj9bl3nfj7pndefg2inm023pl5/fafona.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/futoganaxoxufagow.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614122b515a8f---22368894546.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4f9f6e44d580aa59a3cd872c14758e3d/nojonikosinibanavawul.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/vafikovupiburiwonod.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/banebutexageme.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/81313587864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=anonymox+for+chrome+androidPDF 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_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 10628 bytes
SHA-256: 00be950050b5d2902f7bf2f1f9701b16f8cd72a5c649d4926c5a8252c51574ee
font_01_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 17580 bytes
SHA-256: 52df4e8a3adafd155f34e78821b1d057a5fdbd46dc9e3d7fd5ab10fa81e34729
font_02_sfnt_off0001365a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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