Malicious PDF — malware analysis report

Static analysis result for SHA-256 91eefdb4aab927ef…

MALICIOUS

PDF

53.8 KB Created: 2021-09-27 19:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea360ed8ea2b6680f5d23ece0bd5a2ef SHA-1: 1a47467381212f4c96e8dd44781283fde00896b0 SHA-256: 91eefdb4aab927efc4428302c40db7342c10d148de0b11c6bdfcef8623151a41
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for phishing or malware downloads. No scripts were extracted, but the presence of external URIs suggests a potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8757

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://irlanc.ru/uplcv?utm_term=game+online+ringan+untuk+hp+android PDF link annotation
    • http://gkz-crimea.ru/userfiles/file/6266154173.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/13581952694.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614262d98354f---61824515229.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/33096864586.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/tijisizu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493e9821600---juxinigiliz.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e033ea10d28135f911e8f23a4f0c03e1/70719216222.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/69778871419.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/40203517475.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/17000523721.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/68259684983.pdfIn PDF document text
    • http://glttek.com/userfiles/file/73753280919.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210915202258.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210926104640.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210903235434_7u8mcu.pdfIn PDF document text
    • http://kalikraft.com/images/file/95135667664.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/63870563487.pdfIn PDF document text
    • http://aven.su/userfiles/file/48485324426.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-7/20210907140320554442.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f47f70d3e---750143773.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/119597869.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebc8042e38---sutaxon.pdfIn PDF document text
    • 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_off0000af11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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