Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfd75f7826f8625…

MALICIOUS

PDF

67.5 KB Created: 2021-09-05 01:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7cd90886b2f9a6dccd29cb8eb9cae437 SHA-1: 92b2f8fc13ae32dcb88e0acbf771d024b993662d SHA-256: 9dfd75f7826f8625a8cc85affa95ad16f98545accd1dd02f462a0d803601e20b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic findings indicate the document functions as a link farm, likely intended to redirect users to malicious sites for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8303

Heuristics 5

  • 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://pistant.ru/uplcv?utm_term=icebreaker+questions+for+youth+pdf PDF link annotation
    • http://centromedicoveterinarioadda.com/userfiles/files/13241151125.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/pusunedemenetajam.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/27109937824.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fb029f1a394d33d5f85f35dfd6440532/jefukebitifuwarir.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d4c371b24---83044680196.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/karanopomefidomokudo.pdfIn PDF document text
    • https://areicon.com/images/file/94762199244.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/98162222274.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/wigefejinanuvesikajibab.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/73966373631.pdfIn PDF document text
    • https://camphacement.vn/upload/files/75968248203.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25bc1047d3---wexulajekawifodolerafem.pdfIn PDF document text
    • http://charivne.info/images/file/pevirumakalodavuluwor.pdfIn PDF document text
    • http://aven.su/userfiles/file/bokizorigepoxazotijisetu.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/ferufaretagopanexu.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/wezabegitesawejumil.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608d248f625e3---71994233396.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430bb7c0f2---dubowikukalukufofikulule.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/9641832842.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/62156575591.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/wizadudinasagazugo.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e0508910---90823388828.pdfIn PDF document text
    • http://travellerisland.com/files/16088090612.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/retoxobul.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/44243109571.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_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 16948 bytes
SHA-256: d97d24f274b9d22770b92fa06ef7743005f9bf1d6a0e14de6faf50b4a8cdf393

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