Malicious PDF — malware analysis report

Static analysis result for SHA-256 4781c628ff76a556…

MALICIOUS

PDF

73.5 KB Created: 2021-10-05 00:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-20
MD5: 47d5c18222d1278a2170ce308037aea1 SHA-1: f3e35df1a30f492078c3cc9c76a8221ac6d7d118 SHA-256: 4781c628ff76a5562bd177591efca9ce1920a2479e7c6774e58acc812c7c24d1
156 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=calculus+for+beginners+pdf PDF link annotation
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5d97b0daca221d8f723bf75ed9d7b1e9/xivudadiralobu.pdfIn PDF document text
    • https://newoptic.sas-global.mn/uploads/files/41589280081.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/xikaxufineduf.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161588dfd6c2e7---gonoritagitumodar.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161528352363f5---tikusaju.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/60177344883.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///fadosebowipa.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/12703277351.pdfIn PDF document text
    • https://lazerom.pro/media/file/776863536.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0793616001631898404.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/91591507836.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/4132873296.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/67561016525.pdfIn PDF document text
    • http://tid.vn/upload/files/87655198486.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/43587159901.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/9556184842.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/sosapurexit.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/86732802292.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16156a5480e4c6---72309466161.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/gubosazuzuk.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615969fa7d8fe---11888948795.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/50391916658.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/butimunidiwepimuze.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/vrp6drtrg82hdo9eamb9g6mse0/livowawolakatokedigowejo.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_off0000bb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 17168 bytes
SHA-256: 9f59835ef019f629a73a174f2382e2bbade03034505c60d85f12f75f7fc7a80d
font_02_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 10968 bytes
SHA-256: d9d97e78a5dc643aaf55bf270e885d62f93a323f631c3ecccd3ad26dbfc01c5c