Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7bbd07be44b437…

MALICIOUS

PDF

80.8 KB Created: 2021-08-29 06:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: adcc8c635f64aeb7202a9b01086e6c3f SHA-1: f70da8b39a7abaeed56c62e6f53a6aac23cfbf88 SHA-256: 4e7bbd07be44b43792d2b7faa3d513114578ed28370238fe5587f12a91835600
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially malicious content. The presence of compromised CMS upload links further suggests an intent to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=out+of+hours+emergency+dentist PDF link annotation
    • https://nirkongrp.com/ckfinder/userfiles/files/nagovugi.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/gidaduboladerepo.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/daketobalepigo.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/47041459486.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/c669694332484224c1b9a37720391077/wenowimovejinuduriw.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/87591342464.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa4fb3b800---3304972316.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/76060442419.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/50543760008.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/xibixos.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/nuxuletanezabes.pdfIn PDF document text
    • https://banghenails.com/upload/file/26096434035.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160796819aaa1b---gekuko.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114e3738c9c4---30254849328.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b6dcfb26---24352493740.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/17956622409.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/logomapipe.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/66190508385.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/78222174588.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612552eabd533---37153284216.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/2218bf82c1b8b24f3787e60cdd5feb32/bawixipuvu.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_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 16868 bytes
SHA-256: 839111f72bff8e84fa9e5adc754a8f99cc58a823ed82f1c1be103a8ef046ff64
font_02_sfnt_off00011c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 10956 bytes
SHA-256: 39f42b2071006bb1d1535e04e2de3bb4f825a2dceb308a7e82220b042e3f3a79