Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9a16deadcf53b8…

MALICIOUS

PDF

65.2 KB Created: 2021-09-28 16:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 318893321edf3f78204d03ef5b2f4d83 SHA-1: ffc0ccac0c157410e8dcc0af8c5e495e9409e4ba SHA-256: ab9a16deadcf53b83e15a1c423f19a6252dc487b76ea1fe003a1dfaf0eb3dc14
132 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. This suggests the document is designed to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4763

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd63bbaa98---padusidowaximobav.pdf In PDF document text
    • http://crystaltrade.hu/data/file/6173872737.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/59162915991.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/fusideketawoperox.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202199235524421.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/836768668de0786e187beea4b2209cd4/32110811655.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/kikiwase.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/13129256055.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jesadu.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/zagibetejijagewuzor.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149a2c18bf28---45682619227.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/kenaxewugitoneriwatavev.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/60927291750.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/jazaviputeregegowaw.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/58818289601.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/86039733532.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/3772389223.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/tekolof.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f551b68e6dca1bc9f27b3badc710aa5b/29883678159.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149416f9a273---34520717400.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161508ccd1f0f4---90290547006.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/25139409370.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/90494779542.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/10531675098.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/5761804396.pdfIn PDF document text
    • http://vce34.ru/attachments/file/purulapinoronuv.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/ratodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=change+name+on+android+phonePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB378 10560 bytes
SHA-256: 38f7d25f4d7e81704191195179ac527d3ffbb0f777cc56d19f16d2de4a98a358
font_01_sfnt_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 15648 bytes
SHA-256: f91ab47efa121e1c8a45129877136062aa8068b67bb5f8019c3b43ac8f7381b2