Malicious PDF — malware analysis report

Static analysis result for SHA-256 4541e819c673c0b3…

MALICIOUS

PDF

75.5 KB Created: 2021-07-14 00:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5db77ae4182257ac248e0556a4521572 SHA-1: 7a6b1727c0b9e410f41fe69d8577234ea1148a8f SHA-256: 4541e819c673c0b3945cf43c5ec0d01d971c94f5a2d46c5212d726965e9ab21f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and compromised CMS uploads indicates a pattern of leveraging potentially vulnerable web infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=convert+75+centimeters+to+meters PDF link annotation
    • http://mikomisushiwc.com/uploads/files/wiviralus.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a29d73c798e---98792639343.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a4b32ad81088f21cf008dde5f7054962/xulifatol.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/sotolojotawuxawapovobotaz.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/xalukefavorakul.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050213115533.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca6bea932---fiwuxezafafonuwemaruturo.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/82493948042.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7c3516c8bd45c6983980b762cefa5acc/23989806630.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/80673609911.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d231ca78d89---2162432916.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/d4rgjqbrg41287o8416bvoemod/32915399329.pdfIn PDF document text
    • http://adria-ex.com/79520199857.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/58974194389.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/85300910572.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/10544415889.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/ramir.pdfIn PDF document text
    • http://fvhs1970.com/clients/876770/File/1723672914.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085096598318---vozezamadosapotikutu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acea2151401---ledanerikilupebi.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/nozaxitidagejagiregij.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5r2d9ntcta2n33nc61pcqdl4d6/85077350700.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/pujajamokabepaki.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/sifezetojevigog.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_off0000c59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 10464 bytes
SHA-256: 58d17ddbf3d22a7933fb3c418cad6f8b3ede0ede77500448f8dd5c54b88c843d
font_02_sfnt_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 16504 bytes
SHA-256: 95305900555ca4d865923d528e84a9c1a268f49e708603cd0343ee22911eac60

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