Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb58fb87fc43c409…

MALICIOUS

PDF

97.1 KB Created: 2021-07-16 19:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76e41325e54b33cd8a84f4444542cfcb SHA-1: 892aa0b8836bab4a0577d0c71af32a4142ed75d1 SHA-256: fb58fb87fc43c4098b216c90c72143c2ae65db8c78127b2831183282ffcc01d8
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites, acting as a link farm. The ClamAV detection and heuristic firings indicate this is a malicious PDF, likely used for phishing or to distribute further malware. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS upload links strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4391

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://parzenica-bialka.pl/userfiles/files/wubivatakagilun.pdf In PDF document text
    • https://aldwalia.com/userfiles/files/80261846600.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/jobomojifaxubul.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/kawudazedituwiwusep.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a77aef60f0f0bd6bfeb1c455565683e0/vovalifebesidedoleb.pdfIn PDF document text
    • https://kopari.hu/files/file/xexujogow.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6go7hsu2kp3la4h4rmqkfa5gq3/bapek.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/newekuvupoxes.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/94141125290.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde118d0d2---nitulijepavololu.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/34881680848.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/oh87md2p7ramhihof6hg817gm4/74146981396.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/wonoxikofukodemav.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7apg1dd9p3e50ro4f5otf21gab/guxekofejukogum.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/20953342120.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/o62okeon75u4cvar001gljm3u7/71218298507.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fhbv5h1vlo9a7jpc11upvlua1f/giribineriwemupuzikavuduz.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/getepu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ea43289cffe146584e67b823feb33933/3949434211.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/55a18df87efce4b66d7dcd6bff09cfd6/29718135180.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/vusobige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=f+table+in+rPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13238 9928 bytes
SHA-256: de981567d10100287a356c26a82e5023b408843e8d958bde293b1342d91fabeb
font_01_sfnt_off00014834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14834 15576 bytes
SHA-256: e0d6353e7868376cad353d84f4fb3e11787b0c2efb4312b6c11dfb928cd6c885
font_02_sfnt_off00016e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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