Malicious PDF — malware analysis report

Static analysis result for SHA-256 779ec76890085871…

MALICIOUS

PDF

71.5 KB Created: 2021-07-08 07:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c5946613d3dedc20831142449cda450d SHA-1: b6b54b098c31be2c295ae7b8e7247310dbb51424 SHA-256: 779ec7689008587120c2105a1528659e726f648e0ce0199265597a006b0e888f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for phishing or distributing further payloads. The PDF structure and embedded content are consistent with a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=examples+of+strong+ligands PDF link annotation
    • http://guyfamilyreunion.com/clients/41950/File/89010034029.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a44b9c40e2e---56763393210.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/33032542240.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d4trcdee5pr2nk0ks2m5qqvpfj/89931990362.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/wixurukubu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c2605b22c7aa13d3d2bcf2e037aabf8/61881350414.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4dfe804eb0464b1c04ecde9bb413b093/51674531327.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/q33ofkin29q2sndtnkapbfeni0/74880084942.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/19247699948.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/43615771087.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32ca84b13f---fogiz.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/38ae0e247dbb190ce400896b20eb7ddc/tabis.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/37561188196.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/80307674705.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/17739907228.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9dd78119e550b9d8ed8b788e06fb60e7/41679207976.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/wixinedazukewi.pdfIn PDF document text
    • https://majubesar.com/contents//files/82535119823.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///98823442085.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/51304154085.pdfIn PDF document text
    • http://cocoal.com/uploads/file/46223372084.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/phfseom2d3ff6sbdm40dk881f1/vusap.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/negiwugusaxenok.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_off0000b68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA4 10928 bytes
SHA-256: 817bb264f85ef54cd6bcdda0496d613189a40f0954bc86ccfa4a6e59b9bcc85a
font_02_sfnt_off0000e7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B2 15944 bytes
SHA-256: f066395ad271cdb2010ca27675f2caf785f63d55ddd3ef72cbed16e06daa5014

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