Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2653e3cb9fe6805…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 11:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b58e52c61e56e82abe65cc241ff7187 SHA-1: c693140fe5cfc00fc8781b2e59937a7a1889ee99 SHA-256: f2653e3cb9fe680593eeabe0d5d80901c8a25c460eb1f7d9dc9142c842aadb92
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of links to compromised CMS uploads suggests an attempt to leverage legitimate but vulnerable infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=it+happened+in+hong+kong+episode+2+watch+online+free PDF link annotation
    • http://ekhoron21.mn/uploads/files/54189371904.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e67eb505374366d5b0ec4eb0a6fc2848/nukafutekakufuxi.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/zamajasisukumitutid.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/73311408839.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/5190477609.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/gogijofovar.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/weravuminep.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/97061279107.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/revizoli.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/56972352672.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/94184429977.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148433dd1d0f---79614942324.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/kupekodarevovajugotobos.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/34428759152.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/32357997578.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/mefeveg.pdfIn PDF document text
    • http://jucal.es/images/file/wakofozigunoladizet.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/zagewowiwuvorum.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/fiparanesesifivikan.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/38048828902.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/25998682709.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/73364105584.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146e57dbdd44---36239157799.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_off0000d6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 18112 bytes
SHA-256: 084235fb8c4446821958e4aa6b708a477249d9a942bd8edb4cd4e09d3de3d219
font_02_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 11148 bytes
SHA-256: acc0de380e15ff0dece7fecae0cd80d0776d8011a2ffb16f40939c8bbe117bae

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