Malicious PDF — malware analysis report

Static analysis result for SHA-256 9289467aa09489d2…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 21:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7b586e5be7ea3cb2ee6606ae6419f58e SHA-1: 7974a2390977c8581ea54911033d75e22e54aafd SHA-256: 9289467aa09489d29975615e67a384e30acb5289195551f829c0f0f0fbe44f8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://smidgel.ru/uplcv?utm_term=nokia+n95+8gb+manual PDF link annotation
    • https://subded.org/userfiles/file/91873276807.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/daxetogamirobuvusobidaza.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/694c4526256ea7c6feeec4c8a4c4e327/72662558290.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/98914fb1d1d8fef72b1f154bc3ba2dc8/nopobirig.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/miwaxexidujezezefe.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa152d205f---52847404407.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f95bdf3d8---lisimijewe.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/94751114749.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/43d494032a76d950e928befa33b2422c/nuridivekosipopejamokuw.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/mjngvivfl91fcfl1stqnhmj7j3/nagenekanip.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/33981554013.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dt7bk2u4388ksldlua6lfac0tm/putakogiruvivamowuk.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02360d0cb---rolewapu.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8427ac64c96f4db2fd4f3957bcdde505/49447216415.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/jojikumavokonuruxatizedew.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/vuduxiwojewajofomitajufeb.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/90682508283.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/gimatafelodes.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c8574eefe04f61008ac92fe63aef9482/pekowobenerijilejujisiva.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/67072957690.pdfIn PDF document text
    • http://w-mill.jp/images/file/fokotamonulizixerazugoxu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ad4d2361b342440545be7b0a1d5d84e/17150120121.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/wetokatugid.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/322864355.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/31595170149.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caabbcc690---97536897882.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_off0000bb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB39 19008 bytes
SHA-256: 7c53c46a4d6736d281657f80accead4ea7e8305039866b99ff4af1d5fa187eaf
font_01_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 10772 bytes
SHA-256: f5d8536a96f7f3a1978d151a079660c5a3a71ff4d09e8ccfc0cece24601195dc
font_02_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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