Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4419f1535f60de…

MALICIOUS

PDF

91.0 KB Created: 2021-07-22 02:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 844042bbf6e60f6926b60688271b82eb SHA-1: 87aa4d6ca100dee902c08b520623787fd3d63287 SHA-256: 9d4419f1535f60deba759be437494d566599d225b15f4f41c40c6057e359f9e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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 https://bawaniint.com/ckfinder/userfiles/files/jiloxubirozadadizazifaz.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160955d21ce380---82826260698.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/04b37b87cc32f4c53697b307225de39e/vebum.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/dhqrd4j3q05472c2fk5v261rhl/8549561651.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d9f4df5067cf9df07bbbb43c34a20b1e/nujezowa.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c957cc0499---palemat.pdf
    • http://travelci.ru/ckfinder/userfiles/files/zikuxuxuwi.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab74f19b328---65077899355.pdf
    • https://detectiveoffice.net/userfiles/file/83598403653.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e570b7a464---91590385362.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/debdhkcemoi9lm4fbvq7jhcvpa/23219197467.pdf
    • http://landia-print.com/pdir/file/zatuvipumelajetejax.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c0fd15c1---97399844667.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/la947fmhbv4228uu7ea2df57a1/wonitomokes.pdf
    • http://sequoia59.com/clients/867919/File/widoxomirebes.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8c013591---kuxesapeju.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c06eb06bb3---wuxedaguzojekovapujulu.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/h7o42gf8b1nc6fm0b2nv7r10s0/66401942.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lolapejirifanigagifumu.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ef2eb3163f3c3e72a89b5f09dfc13b7a/kewefuxetulafuxemol.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ecd231c---79063375895.pdf
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/kivuvagavupadipe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=security+guard+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001001d.bin
558db07cf1e051bb99a97566e16d214c24df6d063ba54e331860e2bfacd60a95
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 16888 bytes
font_01_sfnt_off00012bfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFC 16792 bytes
font_02_sfnt_off00014413.bin
751ac7d9eafd2ebf2d23b508c2cb3b719fc59a0af87c8b3e1de1da4e911264e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14413 11020 bytes