Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eeb8815012eca9a…

MALICIOUS

PDF

59.5 KB Created: 2021-09-07 13:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 576a09e96d1f2fccad6c946e1d0abc28 SHA-1: 836440e5f417afc5e4eb2126bdcd10660c5fe967 SHA-256: 4eeb8815012eca9a35e44809053b9b1832b2c0dd7c550440cebd8dd829775c43
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic firings indicate that the PDF is part of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6068

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 http://klimagra.pl/images/wysiwyg_img/file/bumifezinavuribadofewe.pdf In PDF document text
    • https://skvacations.com/userfiles/file/jivefububu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073ff5c7bb25---40318660042.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/9293602123.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/36224692982.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/97f080c50ddfb33005781315ee19139e/noxopoxezekenepej.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f33529ee79---99635618533.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607db09351050---tadikotusos.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dcd2f19af---xovifilukufimadozipabis.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/90377289651.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/pixijazexijegepot.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/xowawebipov.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ju364e7j5uutsu8ekeec5aaaf1/jiwejagemekumiworudusupaz.pdfIn PDF document text
    • http://mp-journal.com/media/file/rufonilavadux.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/vusoxifawezefigofe.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/48292710267.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/87209735316.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/88083654234.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/bometubojug.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/9648c2e2d31e4c7cbf584e98fa442aae/muxotizumekojozalokaja.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/pejojavarugojinoxituv.pdfIn PDF document text
    • https://securitydm.com/slicice/file/8030608708.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/71502834007.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///saxerifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=delhi+polytechnic+entrance+exam+syllabus+pdfPDF link annotation
    • 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_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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