Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdebac8cf019680…

MALICIOUS

PDF

137.4 KB Created: 2021-08-19 04:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 81f2a6631fcf53d971e7fbeeb8f6f6d4 SHA-1: c3a9be167b5e57a036ffc5ec97af686e4db5e61d SHA-256: cbdebac8cf019680c91f5f8f4da9d4d239f2314fa78c2f41c79df6770c2e0fdd
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload directories. ClamAV detected this file as Pdf.Phishing.Trojan, indicating a phishing or trojan distribution intent. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4175

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://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3450d6e90---58161638813.pdf In PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9ca8ab6ee---10103539545.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/tiwojugoneva.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/zavojadojomuzewatelojaf.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e5057bd62---duvituwolizumumuzebelib.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/98751723095.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9cd22e3e0---92712963927.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/vugidejakavu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafb79e8f03---62384948916.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/dojomawole.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/takuzebureboke.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/76078027413.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/lumezoxunulo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ad609873---34565197683.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/97374759203.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/34614919688.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/68545219838.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607685e9d340c---35040401997.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/jcsoostuqa7vkq3npgktaahvms/sabuluzuzoluma.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/fifefumepiwigavugemefekip.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b53147a678---gurewi.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/07/20210725081207.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2cb68e514e859fda6e48c14fba61c6fb/79682120578.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1be424b3d---81716172116.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/lujojofitadolati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=expos%C3%A9+sur+l%27entrepreneuriat+social+pdfPDF 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_off0001f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2A5 10988 bytes
SHA-256: 9bf750e8fcd7d66083155a3296c6daa23cb999ccf224768db06c560edb121e39
font_01_sfnt_off00020c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1