Malicious PDF — malware analysis report

Static analysis result for SHA-256 6492e7e12b82c6db…

MALICIOUS

PDF

81.7 KB Created: 2021-08-21 12:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 91695ff58ee6da25d896bbc5a3903388 SHA-1: 84a6c504a8eb3f7cf78ab766718abb8a2d8ef0b5 SHA-256: 6492e7e12b82c6db26f81a75d3ca9aad9f0606b59b096382ed96a96c8f2ec021
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to manipulate search engine rankings or distribute malicious payloads via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://i3mit.com/shopadmin/upload/files/zugevefoxil.pdf In PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/oeglkdkon48qg0namrj61j57ie/1986627987.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fe9d352c037b27580ba540e85b27642f/53188725739.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/netixatavegovoxexikuwov.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8822fd6fbe---32881970042.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210616_D556C3BDCDF2A6B1.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b067a1c3---rinagetoteselusoludara.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/8fef22837d85419bb8387915964fb9b1/dasobobugeb.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/jipiganawu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ne503teqfmbqlfdlla3c4ubv5p/52897017999.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/42803514549.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/36723870565.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/24c4e71d435c97075cea06bc6ec09053/mufejelilabezufoteb.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/33781371271.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/fukosuwafuzibiguvevuvax.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/pijasosibewotokifodotu.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/xadarip.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/visezuxusa.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/fa20e15a8dfaece341c1404353202dd7/37980359604.pdfIn PDF document text
    • http://novichiha.ru/pic/file/16899192379.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aab0e40e1d3---daxolinodurawala.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/68811687624.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc55ba8a8a---rotuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=lg+inverter+linear+refrigerator+not+coolingPDF 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_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 17172 bytes
SHA-256: 2e80f7806d10dc1ff9f43fbae09cbe29a1a0153733b9ef7a4b31e672d367e0e4
font_01_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 10364 bytes
SHA-256: 719340f81cbb141c941b9bae92d7880ec08094773424fcdc3969e53c067ed959
font_02_sfnt_off00012149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1