Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a78d1bfd943e22b…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 00:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 96139a8c29ec30b123a74693a4525741 SHA-1: 6baedeffaf4a215fd226b3a2367a89b774ab1879 SHA-256: 8a78d1bfd943e22bbd31f9971b8348da0fa90a6be9591f819226315bc3fb2814
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external PDFs hosted on compromised CMS upload directories, suggesting a link farm designed to distribute further malware or phishing content. No scripts were extracted, but the presence of multiple compromised URLs points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=high+carb+breakfast PDF link annotation
    • https://getadoc.in/ckfinder/userfiles/files/19009590134.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a8bbc8a599b4239336995eae0205052f/resosavifaku.pdfIn PDF document text
    • http://www.asslar.de/downloads/topexezexanikarijimubis.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aa18dba1d---lobezipozu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5bc77ff0---gotonin.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/046249215a3819b042e927339d2a90ef/79514230580.pdfIn PDF document text
    • http://royalgroup.at/tmp/65933681148.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072857a33aa6---13803986807.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ca0306ffda9411052fbde519097331d3/360511319.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9nim81ru6kh86nbjocbb7auccv/54509432148.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/24c72aaf9cc79475a8d99b34c4313ef3/gowuvewatopitoso.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/solodebulimuwojopatet.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8e6b257d7b39fe87655806ca095005b0/guronagusebunuxofo.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/jedewaf.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/91732157985.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mrk91lqdqn20euapv2d47lr8sq/tunapofajeworarepoxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af50b94826a---bonekeperoburotevolop.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/sa2f9rn0pi4aefjso31cdsnt47/96222863787.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/buberativinuge.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609c10c7c754b---giziloxazemira.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/7781439888.pdfIn PDF document text
    • http://fitviewer.biz/files/file/90211332708.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/pimibovexifupa.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_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 10568 bytes
SHA-256: fb0dc2d7d98d02fcb980d58effdd808dc1c1d8255f76d2512b636bc8e7ac0227
font_01_sfnt_off000107fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 17004 bytes
SHA-256: ddccf3bbd42f50d35e423d459410f7049aa4d1f7f8cc603977f4e9d36a01d6ca
font_02_sfnt_off000133e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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