Malicious PDF — malware analysis report

Static analysis result for SHA-256 c003ae66315ce7ab…

MALICIOUS

PDF

131.7 KB Created: 2021-08-14 16:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73e7a368c35453b7f9cd76f7afb12e46 SHA-1: 3b0549a7ee2cda813cdbec9a94479ff9997b45f6 SHA-256: c003ae66315ce7abec432d69f3acd3e4ceaffc28e0f78754f796fa240f862a4d
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rulada.by/upload/editor/files/xelunijigujuxaveset.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/25916710285.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/56493098539.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3364aa434---dikak.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6f4339dec94aa2673a3ef33bb43df03b/ditudusovusaxemiwokuj.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/xukufoxonafetalevukadix.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160705810bc3bc---16446913379.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nupiwomalinabovurek.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6a338d8c---posugulolujiwif.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/zobojobevufubokoraga.pdfIn PDF document text
    • https://maturana.cl/upload/file/92953490880.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/digatafezipumiwiloxesiron.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/dedebizidimotepovesuluj.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5df782f37---zusewedazavevimurivoladud.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94b2673fc4---gasusame.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/7270440373.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/53986525564.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7754a10b4---romumebonoko.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/kixoxogurexevavizexapot.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/veminonovuvotovare.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/95739772393.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/32020773283.pdfIn PDF document text
    • http://mlead.net/images/e/file/kujizuzewuteb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=star+trek+timelines+extra+ship+schematicsPDF 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_off0001a1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1EA 17468 bytes
SHA-256: 6bd8ffe391254164e853d4d0ec3acad1b89647824a0714b8beb02cedab8486cc
font_01_sfnt_off0001cfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7C8 10788 bytes
SHA-256: 161a7e1be68572ab7097bd178abdb3d95ebcd5017771464a3555157bf4420b51

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