Malicious PDF — malware analysis report

Static analysis result for SHA-256 4815464ed79cd199…

MALICIOUS

PDF

77.6 KB Created: 2021-08-13 20:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1959621e5bf3d9be31aafde0ebc82303 SHA-1: b50ee1131e9e0e375ae270f2a8f0d20d65f9da7c SHA-256: 4815464ed79cd1993467304418edf9a228242fec8b884e745102a11c1125e129
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6583

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 http://filatelianumismaticaumbra.it/userfiles/file/88186242560.pdf In PDF document text
    • http://akicgiyim.com/userfiles/file/zawosuvinonopozodeditef.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/28204895933.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607036c48af25---bukiwomafetinudaf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5f75698b---12982307981.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/27075081654.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/98195425628.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/22256358595.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/zetir.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f0c916700---tamanusariwulo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac45a56b690---susixegomu.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/xilovajumuwomukeremafap.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/dobiwupoxorusagagaxen.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/93189748494.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210728012112.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/pamesuzoridin.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/merivoxemipat.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/nexoboximijuverowa.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/44402172465.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/64470942162.pdfIn PDF document text
    • https://siroyensao.com/upload/files/dalewenikupolisudora.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/2758575752.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/23982126543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=libro+el+fen%C3%B3meno+tumoral+dr+isaac+goiz+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 19564 bytes
SHA-256: 0a365c4f5161a0758a8c518b3b0c61cbf92e20bec73444f96e0e1faccc4db759
font_01_sfnt_off000119f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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