Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2843638137163e…

MALICIOUS

PDF

132.2 KB Created: 2021-12-06 15:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-22
MD5: eda8ab423deef3cd35805159e8f6018c SHA-1: 8a25ad6c9038d4e88b5a4d8fcbeacfc2cc9d37b4 SHA-256: af2843638137163ed4d1e1f68435016c2136becc9ed932e7a0a2982ba00d4ffc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating it's part of a link farm on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8902

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://rugsdirect4u.com/uploadedfiles/file/mipetabofaw.pdf In PDF document text
    • http://vkp.ru/upload/global/file/97501787460.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/35143310013.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/zudagiromitoki.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/49717622519.pdfIn PDF document text
    • http://grimastone.ru/files/31549593359.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/vifozaz.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161519d988a16f---labofolizabelonek.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/31450747866.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/87346314424.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/38613465697.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/36669346460.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/situfukaxu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161977dd9a83a1---zidemafetezabodowar.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/57490884000.pdfIn PDF document text
    • http://alefart.ru/admin/ckfinder/userfiles/files/rotuxiforififuwef.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/96064877241.pdfIn PDF document text
    • https://actor-conseil.com/files/file/kodelarowudagubi.pdfIn PDF document text
    • http://gerocuki.hu/user/file/xigaxomiramimowuluboxi.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/zexowifotu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6a3f4eb6ebed79e630152d42969cbc60/zexadilu.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/30261690413.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/zavobezarolixexawibapixuk.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/82419370763.pdfIn PDF document text
    • http://bamor.org/userfiles/file/64149360146.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/13381788048.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/31887521468.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=writing+equations+of+lines+worksheet+algebra+2PDF link annotation
    • 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_off0001a3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3AE 17276 bytes
SHA-256: 90e22459f9fdebeaced4b5eeb7009fcb3d9f68dd8c447793cebd35473db3df60
font_01_sfnt_off0001d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0B9 11168 bytes
SHA-256: 3cc71633d19119a8f1960fc0e67ff13910864293f4c7df30de3f4580a3e931b1
font_02_sfnt_off0001ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA94 16416 bytes
SHA-256: cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336

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