Malicious PDF — malware analysis report

Static analysis result for SHA-256 50952753ac20a9a2…

MALICIOUS

PDF

90.3 KB Created: 2021-07-20 18:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ae8e6d1724293ad40ddd5fa0d5070a2b SHA-1: 18c508cf252a4fa72d87b594db1baebdb6547ddb SHA-256: 50952753ac20a9a2fe00bed70d9b13bd105550fcd7e1a9302cd29a26cf8150d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories and disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5206

Heuristics 7

  • 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
  • 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://dakotaterritorydevelopment.com/ckfinder/userfiles/files/numakobevutoxamuzikeniku.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3af174be---20558565310.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e17d8d866f---16843923292.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/zakiziwex.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8c98bb3f---79366578787.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ee5f0ef97ae282fca8def91f751adf35/64319732528.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/rexawefuje.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccac105be9---99318656449.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/feriraweras.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4823fd54cf---fukoneb.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/mevimapujelemisajisabet.pdfIn PDF document text
    • https://gangnampools.com/contents//files/xapofakivu.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/22444922859.pdfIn PDF document text
    • https://promise-land.com/upload/file/jelatugatob.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/80861481586.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/poromizaxej.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/kamuzugupalatigovelo.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/fusibapawidukum.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8cb741b8c4f9f4b6e82e59786ff5d668/vabibezunawe.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/vesegogakufum.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a70dd704d8ece4e6725ea82e70fbe08e/dipukelu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8b5c26c76cb440f8fe430d051bfe3297/zerapenekexutaz.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pi4n8k2levvef0luqddfivqo9h/35893905215.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082233741a12---voxinufezofobototepexad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=shadow+fight+2+hack+level+maxPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 11092 bytes
SHA-256: 725cd75642e742187c706da5d7e4943ac044e0cfa0644d85a1e8bc7820e0a3d4
font_01_sfnt_off000109a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BA 16660 bytes
SHA-256: 3e1a5c08b99c48cfa263cac2d0fa4fd7eb77e98f3e485c9afca6077663a68f55
font_03_sfnt_off00013867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13867 17928 bytes
SHA-256: 3d33279702bce2b6ab9fd4f18a2e95b0ff88596909c84e3a019f1684a1a95b31

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