Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cd37b7e54a4298…

MALICIOUS

PDF

77.4 KB Created: 2021-08-11 09:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 01ee82f1f7f64b1c04100025593bf74f SHA-1: fd448be304c417f9df7f5afd7db4d27ddb2133f1 SHA-256: 24cd37b7e54a4298e1da5645f7edba8eb95b16ea1ce9448cc5d44093ebf6876d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h9tr67ast1msrp1lj1beq8m15c/wuxawawojo.pdf In PDF document text
    • http://muaah.ca/userfiles/files/94556818411.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/rezafabokowawusidez.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kutevugafegifobipebikura.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/xexavame.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/jivoxorivedibowekenulik.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/fiwiteboxadidalosuri.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cafd61ccff4---55972597554.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/v6jibsnvjptr2jfcegissfpb7s/fukolekuvamodigelabu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/1536a8c6b0c0fe1e82a49909cdf043ec/lijawasiverosivegoxi.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/nalusifuxikasosa.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a806b7b146c---23746924292.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/1198526717.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/96926170739.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/638beef091a4981644a9ae6e2336aac1/japezabelovu.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c39bc8cc917bbc7b4888821fa5d2db65/pizuzetirawapofusa.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/54848124635.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/naturef.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/97890347382.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/63256500820.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/20592026928.pdfIn PDF document text
    • http://coffee33.ru/archive/file/30979686197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=kiwi+fruit+interesting+factsPDF 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_off0000ca47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 10520 bytes
SHA-256: be877a5c2a7b819c56c0aa3c4038c75fd743b3b7fd5a726d2d26c754ccbc1bd8
font_02_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 17200 bytes
SHA-256: 30306d4bc790707aec12042a79a40c93f00bf2d1dfcc969ddbad738ed5a49f73

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