Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a6453b1bf6205c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 01:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd00479b93533ea0c82633bba2002648 SHA-1: bbdcace175cc068b27cbf6e6fbffe909a5c35e1e SHA-256: a7a6453b1bf6205c347e0e7315e2d8f9727ce29c0cd1fe3cfe0385070005947c
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs for SEO poisoning or to host malicious links. The presence of multiple distinct hosts and the nature of the URLs suggest an attempt to distribute malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://sporyolu.com/resimler/files/58575815364.pdf In PDF document text
    • https://chpcentre.com/files/file/wurisufulufesive.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/9ge2gsvirsg6g00nsqnq2mo7tn/zigadezapolivuwopofi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/uu8jbmmic98form3sk8b9pf0hv/99343879720.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/tokadufoxut.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/lojefuwudetosuvojiwopo.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16085794190014---43555220205.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/88755705983.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/77c60259e1852904821cbc45d28e43c5/bupamazoda.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/nulozeba.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54fef6c8ee---21235788451.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/243dc7bef5d4fa1299b144c02cf13311/84274176619.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/13925877687.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d381c23aeb6---8142594742.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/bikixirokuxuvuxefok.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/viduzelomotuwosazixa.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f317d960---98381937946.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/derefuwujibow.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/fawukexedokaratufa.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/2g56i591o9ro7t2j4u0ji83lj3/36174507476.pdfIn PDF document text
    • http://planbmedia.hu/files/tojavaluduvi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fee41ba5e6da97b1ed7bdf6ea73d458c/7478225191.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/6338488716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=baf%C3%B6g+antrag+pdf+bayernPDF 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_off0000c027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 17860 bytes
SHA-256: f63c1b07950a018e21182449b1c27b63fe0fbe54ead920020a5a49b78a3702fc
font_02_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 10768 bytes
SHA-256: 53b090b90c2de4d07991f8e8bdf43b245bc33965ecc121a89625edf0c9e0bd0f