Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa39d0ec0c24763…

MALICIOUS

PDF

89.5 KB Created: 2021-07-30 08:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c74c79f12add5d174a40ae9d6fb3af9 SHA-1: 0e878d73a6a3b4373580e585d4aad2e551b5ce67 SHA-256: 1aa39d0ec0c2476350bd7fc16fca9f59baa2ebb3a201321dd77afcc127e8fcb4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely part of a chain designed to lead the user to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160884e896a2a6---bimenomimepuroferatu.pdf In PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/modaketetanoronijo.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/pivozupe.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed2a5a4c6---kutov.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/62486262944.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b966b70729---36651179597.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/gadezatovulosogi.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/77208765156.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a46d56a74---kotinobilizom.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/168pgqqvu16blujpnq8gnjc720/pupuxoxuloda.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vebdn4ninvmcteb7a9q9sr3an1/43347412955.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/327118153ad440f3369f0c3040f2d13a/pupigenozenunoveg.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/2jrbffj3j36d75e01tnkpbnjps/13338237184.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/m2rqcmjeq82lnrg3m3dj6s8jo2/922278375.pdfIn PDF document text
    • http://erdbau-rauch.at/mudozeju.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/porifaxosusamobevojo.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/csp5v9c3tsjkpfsm0u37tfrs93/fomisilanevofufixotozo.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/nonawomumojiwawubukipofak.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5100eaa222---98499688882.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/d1af394a4ebbaf9ade3ab580ef8967bb/gexirizufimokebijab.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ik6cgb1c0ocmojqenv5t06q2pl/22115821234.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/damaxetaremez.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/safad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=problemas+con+divisiones+para+ni%C3%B1os+de+segundo+gradoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 17832 bytes
SHA-256: 3a83e8f0621a7f7cd4e5772d0f7a17db97dd6d101d9862e6d88b26bc6644eb10
font_02_sfnt_off000132be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BE 1804 bytes
SHA-256: 0829c14f55c8efe87d8959cdbf39e83f9bca0589e52c8f1b960b4b01e6bb5d1e
font_03_sfnt_off00013b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3E 11272 bytes
SHA-256: c057358566a59fc789d9881bf67b7a265db06d2ea3e7c216602b897da5b5a777

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