Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1769f456c41b65…

MALICIOUS

PDF

67.9 KB Created: 2021-08-03 01:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dfcc915fdb3ffb06f07c68b1e8b36c63 SHA-1: 287451b35ea24d204df593727b4e83216cf84d45 SHA-256: 2b1769f456c41b6593209cf2f4de5f20ef9a6187f552879cfe2e6e406a0cb4ae
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7302

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://lyzebrno.cz/userfiles/file/vobenuvofibizomisepepor.pdf In PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/53bc21939167012c0ff3e780ee671e91/94780856819.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b41c2034---gazaxisekiluloleleda.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/gafinigajetedagawivifane.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nutiwadugoxetowizapejitov.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/15565296295.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/kavop.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/46889051483.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/7929083639.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce3579500f---zuruxelufavamezikanufo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/1cc1c809a4707c1bfcc5497f1b45e08b/kuwil.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc6a16959---89396393160.pdfIn PDF document text
    • http://chikatere.com/Upload/files/zalefopezoj.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/5673727763.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/ac5eb3834e61b63599f388bf3213f4a8/jivatanuwivigifuwazerenib.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/minarivisigegatipitaveku.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce10471825---lasiduvizurigawulupidijox.pIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+much+money+does+a+chief+financial+officer+makePDF link annotation

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