Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1c6218d946805c…

MALICIOUS

PDF

61.4 KB Created: 2021-09-22 10:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf78ff75cb95c6f8028c80d6d1677d76 SHA-1: 792d156112d3853297dda86493fec05250c71e38 SHA-256: cc1c6218d946805c1febc6467a96af920095c8b5d0ee7b6c74811aa2a0f77f2d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9142

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 https://inwebjor.ru/uplcv?utm_term=ms+office+cracked+version PDF link annotation
    • http://essiac.cz/UserFiles/file/dusagiridinox.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bf57b9876dc5c903049912d86af206ad/70304368576.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/91580499178.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/52535685634.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/3254899647.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/winiworoweb.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/58962871355.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/vebumiw.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/35533783565.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/34224727339.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1f7e463fe---todurelevev.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/zixejimetapujolaxejox.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/gafazitajokoja.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/forojixesewazuxara.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2bc7c47b84134588444f1f8ffea39963/boxagenifesatujevoxibo.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/saregevidosanadolex.pdfIn PDF document text
    • http://trevorhannant.com/77929906071.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631589374.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/jejowukewenajaledixubib.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f087cc0a46---78680067380.pdfIn PDF document text
    • http://merwepizza.com/upload/file/30366618210.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/37887974669.pdfIn PDF document text
    • https://businesslife.com/content/files/30363480844.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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