Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d12c62f643bd2d…

MALICIOUS

PDF

272.6 KB Created: 2021-08-21 11:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41fee45e189638ab27b1e58011944f5e SHA-1: 9c06748b88a13a08739972aeb513615da8ba31df SHA-256: 54d12c62f643bd2d13a2f47e041e531bbebd45f919a3535c880857fa95a06892
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous external URIs, including links to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded JavaScript indicates a potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6910

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.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://archism.ru/uplcv?utm_term=how+to+tame+a+baby+blue+tongue+skink PDF link annotation
    • http://hud101.vn/webroot/img/posts/files/70167433420.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/29483917718.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a49700538d3---74427452731.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e1ad054f2---vusibeg.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/m43q8ccttlllmbmlite5q1kop5/35440947197.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/pokuvonuwed.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/84482852294.pdfIn PDF document text
    • http://goldmustang.ru/files/files/7009648212.pdfIn PDF document text
    • http://ubest.ru/images/file/92861280887.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/27085852989.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/73375b347a06adb2082c7de57d7afeeb/juporaxadoribuzefu.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/93292ec0cce050f82f6128ea87144952/52952781879.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4da14e1223---17416881242.pdfIn PDF document text
    • http://camonetinternational.com/files/file/rulagavewuvuwulevebazalar.pdfIn PDF document text
    • http://zeci.nl/im/image/42327482235.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608adf88b897c---18605708814.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/d095070d0d8d62509a90998a37e4d364/seguxol.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/21571161809.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/75388858205.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/42315733400.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/vqljk4iotqbf3o6eke9c4oejpe/fuzexamaj.pdfIn PDF document text
    • https://triosms.com/userfiles/file/didibikisuxe.pdfIn 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_off0003dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DCE9 18544 bytes
SHA-256: 6a6bd96f667102ca55fcd6529fffb663c82e6ff4b550e2c5186cadfc71ec4790
font_01_sfnt_off00040ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000425f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x425F3 10876 bytes
SHA-256: 2a36ad0e2424037bbf29eed5e74a4c6bda2159d7d493930bf5ee5ec974c03843

Open this report in the interactive analyzer, or submit your own file for analysis.