Malicious PDF — malware analysis report

Static analysis result for SHA-256 d251c38c595c293e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 01:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 21d83ddc1bb68d42b6a1897bc731ea0a SHA-1: 96122b3046efb4e9c188c94329df6d6ed0ebfa6f SHA-256: d251c38c595c293e8fde6c009c050f4084314f4920071a4e140f8e5ff6043dbc
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to PDF files hosted on compromised WordPress sites or disposable domains. The embedded JavaScript likely facilitates the redirection or download of malicious content, contributing to the phishing or trojan delivery objective.

Machine Learning

  • Nyx PDF Classifier clean score 0.2479

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://nomylo.ru/uplcv?utm_term=remove+files+from+internal+storage PDF link annotation
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/wivinepikoxodo.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/55990364118.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139da30df6b3---83052878377.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/xaminezivadadu.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109020837154750.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03aa8724f---tukabunimanupigotamagibe.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/xonemifejezatikiwuzitila.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614064c6b12d1---gotumuzamowotoxapes.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/36160284774.pdfIn PDF document text
    • http://jarosi.hu/files/file/pokotidamamupimunimuxu.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/watunamazowefotakowemija.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141560014f54---77793557822.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e426046b1---nifotugowidokumabetiwikaw.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/benab.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/xuvebaxasokiletupewatupi.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/29666179772.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/33798334214.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/xuxefukafeta.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/0fo1vaeffo4ev1o9as45i26f65/69489004092.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/11759920258.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/3667795797.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/16869163733.pdfIn PDF document text
    • http://hidropro.hu/upload/warazaxa.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/gudesapefudevapo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f06c094e63---jofases.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/79383809983.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/6734503552.pdfIn PDF document text
    • 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_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 17524 bytes
SHA-256: 0f3d77aacba3cbec9c23d356b3d9e381a906b2390e9772b5003103c345986f2a