Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bf03e0e2bcf456…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 23:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 74efe9fdd3c7a5806383f5827fa23858 SHA-1: f8ecb33c588d9340969a996fe5f8250fcaec0d1a SHA-256: 39bf03e0e2bcf4569ef27417571f571ef121dae281a280bb95136636472aa539
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 0.9976

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://infrive.ru/uplcv?utm_term=opsoclonus+myoclonus+ataxia+syndrome+pdf PDF link annotation
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611f5899766b9---pezigasir.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/43876516494.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/puxeva.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/15/tanavinolafodalosom.pdfIn PDF document text
    • http://matras-devison.com/upload/file/temiso.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/45mklgi2pouioiqab62l003567/reweruduvewewikuteke.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1627003208_d28221fd58.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/warogavelelorepidoke.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/88243457239.pdfIn PDF document text
    • http://cocoal.com/uploads/file/51592001296.pdfIn PDF document text
    • http://ave-france.com/pics/files/14059509413.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/39cef7ec3d7eca2fc10a11055f71b3e1/saxuvekok.pdfIn PDF document text
    • https://mmszke.hu/files/file/46290615877.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/xedodur.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/wejuroposamafivu.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a9df3b43d---33195884113.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a02b5ce1---54916829805.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6e94125e3---bavofitozigopikurejevikum.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/98656272001.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a42d4a41ca---6123190700.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/raguvitanupopotaridedap.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/lrbstjn38iotiiau6kk5raoesm/41655822664.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/sifatovulo.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_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 11124 bytes
SHA-256: a5a4216c5d64533fa2045adef61b591b1b0163f98e16e9676ba87b0af978d546
font_01_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 17588 bytes
SHA-256: 728cfa0edccf22130859288245efae74f0e51636b6ceefab359314a0bc6c69a1
font_02_sfnt_off000131df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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