Malicious PDF — malware analysis report

Static analysis result for SHA-256 717b1d70fab49837…

MALICIOUS

PDF

79.0 KB Created: 2021-06-18 05:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16abd8f9b9d65a3f172fced499175d65 SHA-1: 60d422f2a770291fe97d9a5f42abe6f25136501e SHA-256: 717b1d70fab49837040729cdcc39921de8641e496d5c29bc0a00096cb6ad5f15
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly 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 0.7900

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 https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160823a487ce05---migaluxu.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609573c68f50d---punesizabafom.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a02d10aa---91131339433.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/8e61153a003663c51c3c52647f94f3ce/dutezidebalojubab.pdf
    • https://duproject.com/uploadEditor/files/dovat.pdf
    • http://cuspsurgeons.com/userfiles/file/bavukogu.pdf
    • https://hasekei.jp/userfiles/file/xadusinogaxu.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e37ccda78e7d237f3cd69216a2f7df4d/xikez.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fadcc5b2d8---74138438020.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609e91ea59579---10325674771.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090572ede487---vovabut.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/tfndgfqmuvs0o4qtb8v1602046/lemig.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c54b9ea47849c458e0b1773bc9279bd9/98825220353.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/29479094558.pdf
    • http://harasim.cz/uploaded/files/juwojidademebe.pdf
    • http://wildpflanzen-planung.de/file/1075750958.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/524f5b8bf6a4732e628356ec38c23a4b/rixugupemolemeda.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082442e20614---fovebefukaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=new+macbook+pro+fan+loud
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103fd.bin
523ff001604c9fafaff764bb3a304d66bc63940ecb8acf7633340b96b510ee9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 5388 bytes
font_01_sfnt_off0001164d.bin
47a6e50e71c94ef82ed4bb359ffaa07b633e135a98a8dea8f859ea3b049cd8de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 11840 bytes

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