Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c246d530bbae37f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 17:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f3b1f39609eb508af82ccf33d8652a0 SHA-1: 7dbfb3111f9af99ed2eb99b2e428da26aeaaabb5 SHA-256: 4c246d530bbae37f5f2e3a6337a156be789890a101e959d1ca1ec1f91b7b5434
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or further stages of an attack. The presence of multiple compromised CMS upload links reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb39250509---konigasagemudagokog.pdf In PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eef440ac42---delotib.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/08b06105699e3e12821a016d4e6b482a/14626576483.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27c8181ea---luboboxovebalorozowi.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e4a85b50d---94726995635.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/eed8251015a1f0e073737af2c6863c8f/lagutuzomubokakolezi.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/284b9aefffa6d76aa5d93e547059d06a/bivabagemuwuniledatadewex.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/16678676385.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/32518921269.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6bde3a5ae44122f0d815c4bc16f45994/rozeletobolo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/256a2ed0b68648dfe990d90a14ec0641/vabajo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/bdf5ebfa26e97568fea586fc66b46b55/tomodasafifugevelofevifo.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/33249189066.pdfIn PDF document text
    • http://1careglobal.com/upload/files/72989824417.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/doroduvuwajavozu.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/zawanujizanatoluso.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/83240376438.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160890b9967b60---61577260081.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ck516t8dpf5q4ol48d9rc8fi62/41789965621.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/68235738794.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210521191508.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1058819b---35206727432.pdfIn PDF document text
    • http://iwort.de/userfiles/file/revemojagudonexamuviv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pattern+of+report+writing+in+englishPDF 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_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 10724 bytes
SHA-256: b0ed990241869306392769b3bc3c3d0d1171a53ebc7fee64eb99b31d1d0a064d
font_01_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 16536 bytes
SHA-256: adfca06d98cb87c50c3c1840a5814870ba8426250b6c07defe4ba80d021a645c

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