Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf90692ab41286e…

MALICIOUS

PDF

74.0 KB Created: 2021-07-19 05:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03577f8a7b8322ca1b9d613dfba26330 SHA-1: 01e0da608c9fb19f571b8aa1d7abf03921819074 SHA-256: 5cf90692ab41286e145957c7f40ae76ebfce07dccf2e23880e01d9f08d031d03
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd9f88392---lexepuvagogiji.pdf
    • http://partnerplus30.ru/images/fornews/files/zizidukuzidug.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7fae41b7---22228124837.pdf
    • http://healingtown.org/userData/board/file/zivurawovobaxipop.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab954596298---kefufekoroxiwonexi.pdf
    • https://giverny-bkk.com/upload/files/rururajalupilezexuzor.pdf
    • http://botosani.ro/img/uploads/file/91039197466.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/cc08df025d537d1b0d3dfed06284d57f/33517305914.pdf
    • http://ozhelalikram.de/resimler/files/87423225181.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef37770e7c---40438519374.pdf
    • http://phuocthuan.vn/images/pic/file/79626343413.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0c26ae8bf6716ba4d63bcfe5dd88e4da/welizibitapolowe.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3aef3517f48bffb96236aa592159350e/xusopenusuwivaxo.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe6035203c---gomiberusit.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609251f239274---46668271053.pdf
    • http://sumtinathholidays.com/admin/uploadfiles/file/11517889497.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c66d84ab759---zijoletadi.pdf
    • http://penzionriverside.cz/files/file/20533022140.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc83c9d058---69736854186.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d50848e1283---56905072116.pdf
    • http://gesundimjob.at/images/content/files/6594743040.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/liwopesedotixodi.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zolilodoguduwexiwedidub.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/3214643598.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/4pbp2nnkr339la8fi91i0pevbn/fosazegagonixu.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe184344e4---kosatipaxamesikofupawim.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/26lsggcuj028iv9a673mj2k1f2/38694138658.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=benedict+on+admiralty+pdf
    • 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_off0000c027.bin
3ca23314f93dae123e6bdf9038f0bef4ddc99c80bc4dbab09b13348218978a2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC027 10780 bytes
font_01_sfnt_off0000d8f7.bin
28cb9f8b6418ef52d4239ad48aceed9e1f96c5afbe63d14d9b45643129b6ff04
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 16052 bytes
font_02_sfnt_off00010279.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 16792 bytes