Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91ac82a5fa7551a…

MALICIOUS

PDF

59.9 KB Created: 2021-06-07 05:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: ea5cf225eedf4509fd8cac114707bd81 SHA-1: f3c1c0b96c2e81a3b153c94831f8ce2044daeef7 SHA-256: b91ac82a5fa7551a5b04f4cb6a472ae139d5cb2c46537c1f201b5a632db07663
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8565

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=kiss+the+rain+yiruma+sheet+music+violin PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b41be72e9f---sudodopovawesufodunudaw.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a71616b098c298624d8ce81dd09c5299/xeneveniritunasorewun.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3bb6f131---wigemenizaviwixuzi.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/f2tt2162k8nemrpbhph2qbbek6/kawomosizumiten.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1092feea98d1e4a8b3df11e752af63f0/jurolow.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/56113839d51de049f812c1bc489ae109/wobupagononuwifamuvarewuw.pdfIn PDF document text
    • http://allycatering.com/userfiles/61120541409.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/xiwinotetamovufozip.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a25d81bppa7p4u59mcjetfncb1/zupof.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a122e1be2---nubidujatopeligugoted.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b322de9c8---43846459792.pdfIn PDF document text
    • https://petala.gr/userfiles/file/korixad.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/pajeviwofaxaragikukanog.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ed824e9d52018c61a9b7f2f4356fbc46/didanajobegumatufavupavu.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/25236511926.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae916f3a689---leduf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 5168 bytes
SHA-256: 2b25c8feca8e26ead1d0ddd4d0722b6f84b8314218254991b2609ec14d3f74c5

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