Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc99195608433f71…

MALICIOUS

PDF

88.3 KB Created: 2021-08-16 18:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 682c5608e58e24519ccaa795044c1115 SHA-1: 69f91c5a58226b7b84e5ebd58e0a80818f1e3481 SHA-256: fc99195608433f71c4b55bcd454874193bf0aad5b21b4b32d22066e9a1404006
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm that points to various compromised CMS upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/614f4ef8940db857ea074dd58aa38a9b/91777184723.pdf In PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b311ce665---63694187923.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/29efcd294674b8d048a34056511e5525/51729234307.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4dea191dfd---68090855380.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54fb90cb6---kokasugafe.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210804_57DE7A178F2122B3.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/xiwikegatokisononomak.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/54623807472.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee3c344260---26677859033.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/63832948032.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/47789601728.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/11409841166.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/40036932567.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ef1f927f6---mobogowowomebaji.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3d3f3fdc0c60d47644003c9d9d91c31e/xavob.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160895efa713bb---26840630418.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5d48bd3cf4cef829a7f86f44b084fae7/fenisetoxava.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1f96b3da---46605950636.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160832f86c72ad---62074659758.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854334b4922---9973096529.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/27379603330.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/sigibirukowepefojikej.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73e941c97---53622611681.pdfIn PDF document text
    • http://alltechsro.cz/files/86793852053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+lion+king+food+chain+worksheet+answersPDF 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_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 10896 bytes
SHA-256: ca27d19db49607de087fd8f18e1bd08e5b941f9fe2df6f155266dbbae3c524dc
font_01_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 17360 bytes
SHA-256: dab319b309b08b3d5a98467dd9d84c5dc9aa79b3893ac54e9ca6ac00cfd1ada0
font_02_sfnt_off000139fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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