Malicious PDF — malware analysis report

Static analysis result for SHA-256 865f4886c732767c…

MALICIOUS

PDF

85.2 KB Created: 2021-07-26 02:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a480ff37e9195474914e94275039b6c6 SHA-1: 84bc21c58be8b72e46d3c780093f5c9012ecf6ef SHA-256: 865f4886c732767ca3e821cc92610cc6791b329833fbd01da33c64bc752f5136
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces the nature of the document as a deceptive link collection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160915bbd89bc9---66363227792.pdf In PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160874de2a297f---rakajujivuzokipofezelefof.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/859r3h2qlo2hdv29cojrvh1ssm/1319316959.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/af46ff50253f143f1df3ba28ba699441/zewudilej.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/71ebfcda0e067fa3099bbc3830cfba85/gigavanu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/7088016571.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/nuwomibajinoramitopaxajig.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/74434617774.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/89207883098.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec97743e6d6---dininepusofirapusufekixo.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/xobonejekeletemabutodoma.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/26631817860f02af65231b.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/64418316698.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f463623829---zodulexowobivuk.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/n3d4l6pbpkmu01edhianqo0ptv/17975087803.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210621_024236.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/94686129859.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abedf531854---41375047346.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/96674645846.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3acc1d70c---14893923084.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952c1c652e6---11487944694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+bottom+loading+water+dispenser+indiaPDF 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_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 16484 bytes
SHA-256: 339dd83d18b8d48c713bca70abe813ef00fc4ff5be07c51c927bc81634798f31
font_01_sfnt_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 11016 bytes
SHA-256: 633de1ce82d16764895593407597a36099d88f4e53622a7f1751ee0d4d6d0fbe
font_02_sfnt_off00012ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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