Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf905a327e610d77…

MALICIOUS

PDF

83.1 KB Created: 2021-06-26 14:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 83d03a9e5fa00df2e68344392c049636 SHA-1: a2b341248e003e9e316c0bcf5728f7d7b32b5ad4 SHA-256: cf905a327e610d7778a58b91a41eb76f8a95f3758220abf490edacbc0a95d20a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=digital+principles+and+design+by+donald+givone+pdf PDF link annotation
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e56372d9a8---88086588954.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4a7a32cc4ddb8df84addeb78faa9ec72/tatesu.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/newuberesul.pdfIn PDF document text
    • http://holzbau-napetschnig.at/77788273709.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/rizovokuw.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/3772764232.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/9db9e14aa13791e1191a91fc51409103/xulibam.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/crpmuo2q6i8556f4r1i4dcuti6/ruxirunevomadebon.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/6639275657.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/waxafamibitake.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ac4ca7868---20986024763.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/22512619502.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba92b2af216---zubekonuj.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/18980076113.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/a2326f7346f9b00f0c8ff4dbacc45aea/44724288618.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/wupovonofibigujal.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ln80lfqse8c7mdp6o9g4nsc0gj/55982928998.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/fopazuda.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c86da1379ea---zidazok.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5pdclcjoeqktbunv6sba7jm938/wasukajesewebezen.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094529c2dc98---guruga.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/83471645140.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/1112bbc6d35ed61cc8a088b5b71793ee/furuwitubuvopojaxinuz.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/bulijakosatikol.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/90589824276.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_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 11116 bytes
SHA-256: 56621611cf56313196ce07cba2379a0b11b4e14effc13c3d3d5fcdbcf42decee
font_01_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 17896 bytes
SHA-256: 74c2cdca1d71913e935d83b559f4e5cc6fcee0a1f7805a99762e5bbbd84a9177

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