Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b78d677b7a9c9b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 01:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59417eac7a75453483533b9b3d6850b0 SHA-1: f28878d2e08515cc09be260403fa1b0c43f90fd8 SHA-256: 86b78d677b7a9c9be5d1e1ffd6eb79c2dd5667f408ff8d10949df4f3c7f3b10d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm or phishing attempt. The document body is heavily obfuscated and unreadable, suggesting it is designed to hide its true malicious intent, likely involving the execution of embedded scripts or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coomargroup.com/ckfinder/userfiles/files/pizepuxukojofur.pdf In PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210707_9F62A19E5606A5DB.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a87fdf1f4---konezajane.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/48444429302.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/54716243244.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5715e5df6---60347158589.pdfIn PDF document text
    • https://phr4u.com/files/57848728748.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/66557958115.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/19780992203.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16124f9fd65e50---leposanunidatofadonavaz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6df5fdac---36265008186.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/muvajiwifosufapabojazam.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/30588670960.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/24745764031.pdfIn PDF document text
    • http://heizler.hu/files/file/98366722087.pdfIn PDF document text
    • http://burke-gallonfamilyreunion.com/clients/28163/File/28750259358.pdfIn PDF document text
    • http://afro-safari.com/upload/files/bojufegatawofakisuku.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2b4ddefcbc5420496641b75728a6f76b/wigakejobizibapi.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ba04bf9920ea3d7b95a23c0f823f3e4/misevowuzasezoxag.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/neduvafurataz.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab470ec57a6---3908703073.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/3084637508.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/59436934824.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/zetemelisemobosobilami.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/walovufesutenelefejepez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=2d+shapes+lines+of+symmetry+worksheetPDF 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_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 17140 bytes
SHA-256: 5ad06857c2672f3599c3bf24a7c5cd43e55f22db3eba320b4cdde7aa3498a691
font_02_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 11080 bytes
SHA-256: 71cd02cb28c3cc6e3ff2297746115a9667222bfa1467d6f7dd9ce41878c9989b

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