Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7af8cee0477e42a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-16 21:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d91c8d146e106988e3d9d4a47664a436 SHA-1: 02038dc881bf0ddbfdb47664c9987732fab1d8b6 SHA-256: b7af8cee0477e42a9262b3c7e7fcc1084b7915d32b845ac65265d7ed2107ba7a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8398

Heuristics 5

  • 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
  • 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 http://expresskaliski.info/file/41817115611.pdf In PDF document text
    • https://astdubai.co/userfiles/files/bekotulovajuletukipo.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/nasuwaninomijamixubale.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/vedixabe.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/97754493575.pdfIn PDF document text
    • https://norservis.info/files/files/39690022282.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/sedibebo.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/88644792322.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/a2f1771033f2a27452b5107ecfed2442/walonevisafusiximifisu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vhr65qdbo8fn2pebipt4tu6g52/76682831249.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/sewekenobolud.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613afbc8b9a83.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/xarezomurifixapigib.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/79666520360.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210904235457.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/rezoponulonizezejep.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/38784326039.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5cab86b6f0b36b21dbf35b6ed1a08542/zikagisatujid.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/20840246617.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/rovidonibetivux.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-11/20210911121851363029.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/fipesajefakigejoriwufeja.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021941221476540.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/29403736245.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/13006949180.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/gawefozuzuwib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=solar+movies+hdPDF 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_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 18028 bytes
SHA-256: e9fa29756a778eb0517ea398d8e3d9a3b0f35d72961f968d05849bd6560d15ef

Open this report in the interactive analyzer, or submit your own file for analysis.