Malicious PDF — malware analysis report

Static analysis result for SHA-256 734966dff527e95f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 10:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cbb1aaea33c5729a73491bbb6c2af72 SHA-1: 68b28f4ce5f93036e6b1ae88ec3c2780263e4e9e SHA-256: 734966dff527e95fb052994ce2dc57247395d2b06acc84a6f4f8552337be37d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and the link farm structure strongly suggest an attempt to lure users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sammyuriasproperties.com/userfiles/files/46410396530.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/df115a30726d8a326bb601a20d913f06/23139467276.pdfIn PDF document text
    • http://atek-ent.com/upload/file/rugapexav.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/i2huk9vuq0mfgda2hlmklv8kr3/70847978055.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/98272234945.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/mewasefawiliwagaxubusax.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/30077484196.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/galemo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ccb44b142---75734991864.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nugolajisi.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/k03492kkp4dqeop4q6mp7tbqc1/57254556941.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/61716140840.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a7f95d0b---kebusurasi.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/xavixoxivume.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fecf3b361a0c17e1dc784e279b63320c/23468459042.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kelinatosefoxinelosonu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607209e8ee97f---lexalozirawa.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/nasubemasusa.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/dovixorov.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/87001962622.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/kidafuj.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4j6q988hj1r2qk3ioiq17arh8l/xogimoroganowepexovad.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f42c8db9a3ec25c8e5509a639b9730f8/vapexirexexuka.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/94119089130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=calculus+motion+problems+worksheetPDF 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_off0000b3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EC 11088 bytes
SHA-256: 930e811c32020bdcc22fd303f656fb37226cd3c748cdc6f4967ed6c2aa5b0192
font_01_sfnt_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 15108 bytes
SHA-256: d9e587b7516742ff0b3bc02091ed5d54214e2dd8e01cb26afbe8d5542ff047a1