Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cdcfce5075f2fe…

MALICIOUS

PDF

85.3 KB Created: 2021-06-29 08:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 7e285fb1b2f8b56f96812e7e10cad511 SHA-1: 6715dffbb86de32bf2a22739c0df5d371f59f747 SHA-256: b8cdcfce5075f2fe9f512342fea233d659b37f5f32846170b369804d3152d64b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=chemistry+for+chemical+engineers+pdf PDF link annotation
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609400548d0a2---noniwejete.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/59956039277.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/zipukibinuw.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d3e8209e0---mutogufipelexikepefiko.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/94a9d1844c30e0e93ce2673571301c90/vojivew.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e308c341---63338016723.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857e6246ed2---17776108381.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fa8a285e4---wukusixetasovofinabos.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/97011933391.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/24411243536.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2df0301825dcfa1c1379b474682f6931/63131471442.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1f92097b3c18699e80f577520ff6b1d3/8397505285.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/33165116501.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/vabiwafoxu.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210617151723.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607683ce63044---diserajonerudopoxepos.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/lamozonatozina.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/vavevijegarunige.pdfIn PDF document text
    • https://temahr.hr/files/nepebuvis.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808a30c1908---lujunubixed.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021053000362325.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/moravopisabazewesade.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55334f339b---63468759402.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_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 11212 bytes
SHA-256: f4702c955d939212eb55e54d5bb85a471323ba035dec6c8189ed78f5316e3024
font_02_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 18164 bytes
SHA-256: 085ed68e4763d8cf6c274c014be6b3570e1ec483bb290e22ef51d292e45ad684

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