Malicious PDF — malware analysis report

Static analysis result for SHA-256 24efd4ae63d2896b…

MALICIOUS

PDF

98.8 KB Created: 2021-09-06 00:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7af24439d145cc8b8b113190917765e3 SHA-1: 63e6cf0e508bb8b222f826c0a214bc93f81ef567 SHA-256: 24efd4ae63d2896b93294401d5b26495276781b1907f67663ecf145d27bf544f
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 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=vocational+and+technical+education+in+zimbabwe+pdf PDF link annotation
    • http://casier-a-bouteilles.com/file/susimukowezelojenekosume.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/tetitakugakubo.pdfIn PDF document text
    • http://nprofit.hk/userfiles/47125099601.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/31427217521.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/73162635293.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/3878162383.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/kifetu.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/vozuluve.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/rutis.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/faxofegojijozif.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bba8b81a0---13611772416.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/fivisonukarariduzexitix.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/wokedurud.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/s94qf1r5h36j55t7gf2j6931hf/52648401327.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/ribusokedamobox.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/gijujupujubukorakuw.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/degapegurodu.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/14353748816.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a8e4e38c70dc9401367cd06431d0206a/93630667565.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/tegakodanemusagepet.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a264f4a499b---nawaj.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160883937c34e3---827335202.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4b419c6c561195cde22ae406e9bf6a13/wulakajuto.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/worutuwuxipabojopulu.pdfIn PDF document text
    • http://recviem.ru/img/upload/6328178317.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_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 19680 bytes
SHA-256: 349308352e1b839ec09c20472863ac4881ab4786ed933c8cf49c2f15b327b8d3
font_01_sfnt_off00014bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF6 10972 bytes
SHA-256: 5595e333b884c19d2ef9954a5863e9aff8087b76576ac0dc45fa3807f2ba3d32
font_02_sfnt_off00016510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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