Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75500e76dec23cc…

MALICIOUS

PDF

77.5 KB Created: 2021-08-25 16:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc0d9839e25887ea01ba6384c9f2efe6 SHA-1: 365dba4d8aa0da5779ed33c8c13be4b2c40f05e6 SHA-256: d75500e76dec23ccb04ad1f998306d7f3b73846c77e8273537b86e949acc0a86
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to facilitate phishing attacks or distribute further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bouwbedrijfansing.nl/userfiles/file/954346213.pdf
    • http://daoltrading.com/userData/board/file/sozesarekiparosetalo.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd33e316397---remosapetulunoboguwidili.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e07eb75a0b4---47675305384.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c718816b4ca---60800515561.pdf
    • https://urbanlivin.lu/userfiles/files/pojip.pdf
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/nuferubexulemaw.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ngbibsfba59uipsbt63tp40la5/ruwopixipusig.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/raveluropefidine.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1611204f6512f2---71658813160.pdf
    • https://milliondollardesiclub.com/upload_files/featured/files/pavilanenipenalefasipi.pdf
    • https://vico-real-estate.com/ckfinder/userfiles/files/40470736771.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc51e6a39---15715000604.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1213c0c33---vuvufudavajirozaf.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/da86a1c658635f2a004c6001248f46a4/boloxajeme.pdf
    • https://cottonweb.net/userfiles/file/44401425359.pdf
    • https://grandplaza.bg/uploads/assets/file/vevazalotixegiref.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/8k3frc6902ca8ojl7b9cpf2fi3/jixuzalom.pdf
    • https://meesens.be/KrMee/Tekstverwerker/69873412292.pdf
    • https://sunarchegypt.com/userfiles/file/lesusolikuguvu.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff09336ad3---61155786392.pdf
    • https://consurs.ro/ckfinder/userfiles/files/51061931044.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=of+mice+and+men+student+workbook+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c859.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC859 16792 bytes
font_01_sfnt_off0000e06b.bin
e6ef77e471418d4a897bd7748b533f2cc3f3c31154473aba846845425ef7a459
pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 17284 bytes
font_02_sfnt_off00010dec.bin
57c7f5e7beb841d034f7b8ca43c67ea08c13e374e1d745f6c1f9044385079c1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 11032 bytes