Malicious PDF — malware analysis report

Static analysis result for SHA-256 970acf35d4897f8c…

MALICIOUS

PDF

80.4 KB Created: 2021-07-24 02:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93d6ed5b3959276ce4e3da13a36d2814 SHA-1: a845e1cc228d8c7b7a6bd125e8d5ce16450ea478 SHA-256: 970acf35d4897f8c0bae48d5f7756155d535c60aacb4c43e8510970714269afa
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites acting as a link farm. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6637

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.
  • 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://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9638d17efe---81106730105.pdf In PDF document text
    • http://nsdadventist.org/FCKData/file/14492390875.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/wosesupujokukugida.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/46081152325.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ff6127fb7---82419978935.pdfIn PDF document text
    • https://pecsikult.hu/files/file/70624897146.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0d36df45f---wulanerazuv.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/28527401578.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/e799cf8b7809ae24c3452b43cc6fdf7c/gorigifavixilezupabi.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/nixerek.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/46800972492.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701ed705321---mudenidivofoladawedorajip.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/9ac4a5554ba6a4fade120338a8074050/tukapalazuv.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/ligefitibun.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/uajmntaipgjl5nq3mdu9ij417c/52966661565.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/ratenalatemolofateli.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/7052065720.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427b09871d---55625679688.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/wujikuvidobawov.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210626010316_1297801353.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/wubokibeduvifuwupevalev.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/wuxekajuxadowobubimu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/37f53d1225f7926b39d0ff1a77831f6a/taninijuxizivewesaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=are+half+moon+betta+male+or+femalePDF 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_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 17696 bytes
SHA-256: 5deef3da9ce5ec3e4a3be138c845dffa3227e6419d1a77218bf88fab0eb86415
font_01_sfnt_off000121d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 10340 bytes
SHA-256: 781ae6f18de3763a007ab9e94050441feb8a24ee0f3fb3ee408e1ce0ff076b51