Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d63efca3301895…

MALICIOUS

PDF

62.1 KB Created: 2021-09-22 09:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e89322155c2942a7dbba96bb0858c349 SHA-1: a4cca385cf93bcbfeaa1818db687c869650655f8 SHA-256: f4d63efca33018952881824e9e4061b3abdad3e93362723d2ecd1d9680e7fcbb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by its structure as a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7557

Heuristics 5

  • 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
  • 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://clinicamanila.com/ckfinder/userfiles/files/11049038410.pdf In PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/75bbe7648b752be41d4d4af494116674/87446314951.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///dapexabo.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/33360564364.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/vojuvijujukige.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/repojepotelumesadag.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/8342973142.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/19597728420.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/zevadovepasizonutarowexas.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/voxuzalidab.pdfIn PDF document text
    • http://abwrva.com/uploads/files/vumetokodaderoja.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/xizexe.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-10-10-23-05-87.pdfIn PDF document text
    • http://cartopack.be/Images/file/30263687633.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0dd7340f57ea8b05329d6f9bff2e7be7/kovigefafovatu.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/zarifosusumalapegok.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/87015100551.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/ruzutofukijibusakunegi.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/siminipe.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0e9158e1be663c28ef896e332f6d5aa7/6672888718.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/disipu.pdfIn PDF document text
    • http://imaginove.eu/data/Files/59422295528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=my+new+iphone+is+not+receiving+text+messagesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 11136 bytes
SHA-256: 27662bb55b4675b2beb2685bef863fbd474ff4eee8348b85d394a59b767113f3

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