Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b16bcbbc7ae3026…

MALICIOUS

PDF

86.4 KB Created: 2021-07-02 08:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eb90bfb21586547b28e5866eb13504b6 SHA-1: ea4f0817c747145ed0c3771cdbcf801cc8fef360 SHA-256: 5b16bcbbc7ae3026bdbdb1ca894bc6e3e1028fa780659c414663367bfcf91999
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous URLs, some of which are hosted on compromised WordPress upload directories. The presence of many distinct hosts and disposable hosting suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://novahealthclinic.ca/userfiles/file/pugegejikudegewuvejine.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a00511bf---kiminumexebopifemek.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/15843192449.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/mukavive.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/61272025607.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae045feaf85---44997482555.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc46cb3e756---98244862784.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/godowewomotavev.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/29711435784.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/7de0310aab821c51d63e20576edf8aed/tobubavapav.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/93917342142.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/5624115949.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/f1b0808679a9ccb2d4744d7982999da0/53639329628.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13d8608782---19534452460.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h2me8s3slk9cqb175auii4k5ev/90790637268.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c57ee9a3e---bifedufazeduzebamo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086583252400---razavanobogazizezedamez.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/selitamapelulij.pdfIn PDF document text
    • http://akssert.com/userfiles/files/47905784511.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/08a21449501cd77f1aa21e9583778c4e/86783696926.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/43377310886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=starrdust+goldens+and+havanesePDF 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_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 10676 bytes
SHA-256: 53002b69863adb011aa208b02f85e3d4b1b6d90b06574de8ad92f2b1e5ed9fc6
font_01_sfnt_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 16232 bytes
SHA-256: bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
font_02_sfnt_off00010376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 17580 bytes
SHA-256: d142ee5465d4e5893d52e5f90b7ca50862ffe8b7329d641a66fabd2dae85108d

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