Malicious PDF — malware analysis report

Static analysis result for SHA-256 520241afe9bd6a69…

MALICIOUS

PDF

97.4 KB Created: 2021-09-04 02:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 3c085e61f9aaf82e65e892ba3344f39d SHA-1: 8641ce15225b4a1b19078d52b9e0d79590da515a SHA-256: 520241afe9bd6a695e314f1713927481a94c9a389c8045abd8e377456e311a46
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript

The PDF contains embedded JavaScript and external links, with several heuristics indicating it's part of a link farm hosted on potentially compromised or disposable domains. The critical 'SE_SECRET_RECOVERY_LURE' heuristic strongly suggests the document's purpose is to trick users into revealing sensitive information like private keys or passwords. The embedded JavaScript likely facilitates this phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6b872871---44219020098.pdf In PDF document text
    • https://artlabjo.com/userfiles/file/wavago.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d254e6818---2843993842.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/zogemokonawujexegowepuj.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16203571665706.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8uvdtdsheijm9hd3a1f4gq76m7/vabaxijovolaw.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/sulajoxa.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/besubalulidalugoj.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/65669312777.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/kugutizavodakeroti.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/vorakexo.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/34625434386.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/476faf80f65aa6bc2ba40a72ad674658/78468670566.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/mogividabufifar.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfea46e2581---64801762663.pdfIn PDF document text
    • http://drironcat.com/images/file/sesegosatixitasetapat.pdfIn PDF document text
    • https://webmenuplus.com/images/file/74679883564.pdfIn PDF document text
    • https://soechi.net/userfiles/file/migasomitapumutoduduzuniz.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210820_191238.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/52629329841.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b7bf20b90eb83145a1041aa58803ad96/waforiwujuvum.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/12601467036.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/zuvivijipejuwenon.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/33264741045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ethical+hacking+step+by+step+with+kali+linux+pdfPDF 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 extracted file (font_00_sfnt_off000114df.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off000114df.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 11296 bytes
SHA-256: 3067d2db18db9eedb7ac06bba2bc2906122631220ae17a240cbd32167d3cceba
font_01_sfnt_off00012f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14717 18780 bytes
SHA-256: 98d17f868bebb03f97704f6e3a3a5f4c5f1650f8dcdaab3b831e20fd55aa6631