Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af4e97cda5a5034…

MALICIOUS

PDF

69.3 KB Created: 2021-09-07 20:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b16907e11979da56a498a629f4623e4 SHA-1: 2ad6f0fef37449577cf53599da94da4f68dabd07 SHA-256: 7af4e97cda5a50341972a1ba00bcdf8fbcdd34175e035a4c36a1ead2c4cf9cd2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. The document structure and numerous external URIs point to a link farm designed to redirect users to compromised websites, likely for phishing or to download further malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code directly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=estructura+y+funciones+de+las+proteinas+pdf PDF link annotation
    • https://yz-yongzhong.com/upfiles/editor/files/nozodewino.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/94492087766.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a489d619af0---55481593653.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/95575960026.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b21749a0d0b8d87aad3698fd7859b267/kedopo.pdfIn PDF document text
    • https://abeess.com/userfiles/file/dizovi.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/fatetowobarumovo.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/marezefabol.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ecdf287ccc827ca97709f681c3a4c754/gezisupudeguruwede.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/fofelujatijiwojerab.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/064acf6dc8f5ccef72d8e172cae126ee/99078556089.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/50087039500.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/wodejavirako.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a565a73f47b---gulugexasilof.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/xoxim.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cd162ef862d3b1a5c6551920f7357cd8/66946864339.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4ebdf891---vepurejigekazigi.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/91951860594.pdfIn PDF document text
    • https://tivicom.vn/upload/files/letexisamuwawifotabe.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b19ceacdf---nofamusobigenaferi.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/kemurafewexakesib.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/bukixokererilenozeravum.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/nuranorakunugu.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_off0000b33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33C 14152 bytes
SHA-256: 953aa90657a3c000ff6216cfe665b04c2aff782eb8c9fb7de8fc8e17f21a9f7e
font_01_sfnt_off0000d60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60F 10812 bytes
SHA-256: e59007fd45656289275d5c568029d48377d0c4061aea92681a0de50d9e1ae792
font_02_sfnt_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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