Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e7e7d94c50d549…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 11:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce7bd725f4da3e0322f8a5d8c788e25b SHA-1: cda2e052be6cbbcb94b3a96c7f1a7d0863afd228 SHA-256: b0e7e7d94c50d549df37eb98f0dc175673038bd34b5b4dc757634c3e782ce605
236 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, presenting a fake CAPTCHA or MFA verification prompt to deceive users. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious content or credential harvesting pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://krisoc.ru/uplcv?utm_term=outlook+agenda+synchroniseren+met+android+smartphone PDF link annotation
    • http://cn-daomeng.com/upload/userfiles/files/4660614e1169444f2248a911a143bf7d.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/053f6bbf92b1a668c56674f2099f02d6/piburuxukosu.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/xakovusesunobiraf.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/26522655837.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/8d55468379ed3e2bbe2466d6086a17ae/kifalafamevosowitupome.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/81895909924.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/nafusadakisinos.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/39919708960.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/40827406425.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/91883108955.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/31480825561.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/84211185136.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hcklhaofaruvig4aeittak3ep1/xekixezemigala.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/kanubov.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/mudufipepedivejativajibuk.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/97993663038.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/febimepewudiloxinibupani.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e6b08b130c7bdef6ed25f724ea551ec4/78022001314.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142078d33827---44226333810.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/nepikigomepegijoxumi.pdfIn PDF document text
    • http://eva.am/files/718bfdb4e8dfc6fa.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/lupijukisa.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/27305949479.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://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_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 11292 bytes
SHA-256: 422e59cdcefb0d16eb7fe4f50ec41a81bc8abc8129805e8a8a09efe31d0dd3b2
font_02_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 16872 bytes
SHA-256: 38c6364937b7169087efa25a72f7d94ddd1e2b33f87a567be5ddb2e4b28bc307

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