Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdb516097e17d3f…

MALICIOUS

PDF

97.6 KB Created: 2021-09-19 23:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c88c261eb898bdf2d68d44cefd75991 SHA-1: df00196c374942698ca971819086f93c6e484bb0 SHA-256: 0cdb516097e17d3f4a3bc3ca22e8901bfe2bde4d3a2ff6d4bb0a381c6bb2e9f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution, by redirecting users through a chain of URLs to obscure the ultimate payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://levne-pohary.cz/UserFiles/File/datoj.pdf In PDF document text
    • http://lavalnerina.it/userfiles/file/98799799701.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/83011436506.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/zotufanukusupuwesokojot.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/90814363033.pdfIn PDF document text
    • http://japhina.com/upload/file/zejikiburulawamipusilo.pdfIn PDF document text
    • http://leise.ru/admin/ckfinder/userfiles/files/26368882955.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/60984646350.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/jumule.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/12813928123.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/95704864899.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/23703674224.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/97574553553.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/joduxesur.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/63730578352.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/fumutikuvun.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3391edb7---mogudoxajotufujubudukum.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614625e75c54f---zaveraxewajukidebaxulot.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/4516532131.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/16202510014.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/tozokajesevuret.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141259db942d---41356926440.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/nubikudomevobobebu.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/75417740729.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/lamasuji.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/13778818842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+car+head+unit+appsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off00011aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 17144 bytes
SHA-256: 0c44ed2a78e0c489bfed3be9711717277f726c381fa0ec99b7dbbed30565427e
font_01_sfnt_off00014812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16029 10648 bytes
SHA-256: e9073f33a87f02eb761b42fa6b80779d9fd822e02c76f46537c0a23a151ab281

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