Malicious PDF — malware analysis report

Static analysis result for SHA-256 507ce323f19492df…

MALICIOUS

PDF

102.6 KB Created: 2021-07-02 04:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a4275234cdde81200e9196fcfe72d7d SHA-1: a30d5ca6e3ab1932736d2100e51cbe21e11ca338 SHA-256: 507ce323f19492dffcf6810984f1fa03ac679f6340249ee155dfa767e439ab8c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://inwebjor.ru/uplcv?utm_term=concept+mapping+chapter+6+organic+macromolecules+worksheet+answers PDF link annotation
    • https://vsetinrally.cz/userfiles/file/zikut.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/87169266590.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/06804503ccbf53fdf0ed2321c2245f4a/67893234014.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9b53fb79---19198972815.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef79fdc70f---50131361114.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/71357634521.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/92201243772.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/xasaj.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/83688581212.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af784885c73---82122704491.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/47ne73q4d12u5fqqdduiin9qqd/labebaxuminiz.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/12ecec3d9d5138a823b3587feb401a4c/buvoduxofepotexenu.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/31649297814.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083badd760b2---12256005174.pdfIn PDF document text
    • http://secretinvitation.net/images/files/19619904198.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/fetukekekixogagijesu.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/tugoge.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b1571357---kaguzajubewa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/q8ngpu0bhsrf0un3t1qaeb9kfk/megigas.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2a4743c46---gofiwamufobi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ffc1ef69---71006010219.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9c1f1fd5fa530ae6cc8a7b9f5e13da8d/kewizisixobaxokukopoken.pdfIn PDF document text
    • 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_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 11296 bytes
SHA-256: 35dd0bac92dc7bdde3788cf0be0a23d3d3e94acbd328a0eab9a111b2be12d10b
font_01_sfnt_off00014368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14368 17916 bytes
SHA-256: 1f34a7afd8b7ebedec8ce44ba049df3f81101a5db3545ad70c947eb86d71870d
font_02_sfnt_off000172af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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