Malicious PDF — malware analysis report

Static analysis result for SHA-256 3667addb4c6bff64…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 12:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3fc67541798c916e203ea828c887bd02 SHA-1: 25ef6c3c2f0b016d6c56c41e7814144e64dfc8f7 SHA-256: 3667addb4c6bff64119664719605d5de35246de8d50a0c68c2a8cc8d0d40847b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fff6146fa010c10963e2d8db2547df2f/faxexuk.pdf In PDF document text
    • http://reguitti-engineering.it/userfiles/files/tutebuxuj.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc8389ebe6---ruzefumesixag.pdfIn PDF document text
    • https://attack.lt/images/files/kivejibiluwikenurewi.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/62239610109.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/71136921418.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3fa3efaef---69855430365.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/zonogajurofu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2be37c2561---6828014493.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/jibevamojo.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99004768494.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0753397001629974974.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b140faf3---fukumidi.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/vanolideben.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/93805987976.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb3bf66b35---gulidafivibevodovunefuta.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8c8cff95c8d15de86f3cf92575722f30/funevapuwokozavalumuxit.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/46884267792.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089656c001ae---92469374518.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/83444743527.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/46272705993.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fbcc7028507---89171995792.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/72374533945.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/85177976582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=carbon+dioxide+is+released+throughPDF 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_off0000d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 17352 bytes
SHA-256: 54f9429601bdcfbd0c9aee8395119ffd0656fd50b455f6eebe41854bb9be3607
font_01_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 10900 bytes
SHA-256: 8d7fbacbd796968321d9f1f87c2aa958d042dfb9c54127677c8b28a7712b57c1
font_02_sfnt_off00011a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1