Malicious PDF — malware analysis report

Static analysis result for SHA-256 87712c702819f091…

MALICIOUS

PDF

95.1 KB Created: 2021-06-27 16:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26cba81cda75c2076e2924db976d1812 SHA-1: 2cf482deb1b8d7437ab63df517949e47f3ef8b1e SHA-256: 87712c702819f0915303e532f6ae1705bb948e1e96ba1a8e02c7816be2155979
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://queure.ru/uplcv?utm_term=indesign+numbered+list
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/3lvbodsjssau1vga68s8el5q6l/guboparirolekuneke.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ff9741505---12001762434.pdf
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/83315462791.pdf
    • http://alfavs.eu/userfiles/file/18974245910.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1c6d5b0aaddbdcf24279407a2fa10788/bedawurasanokagidadoged.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ca38e29d25a1b044bb9e157e465a330d/51509687178.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/be89df159eec7bb625987b8d3cfdeb4b/mugekokigufa.pdf
    • https://coluer.ir/documents/file/zuxogetofuf.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2a5c891d---wenokepemojovo.pdf
    • http://charontrade.hu/data/file/59522540697.pdf
    • http://alfavit.tv/userfiles/file/nusabutagezegelavodojetif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011191.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 16792 bytes
font_01_sfnt_off000129a3.bin
bddef19726adbe106f7cc10f4684a9509a8569c859a4b5a2ca1b97325749f8c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 17560 bytes
font_02_sfnt_off0001573d.bin
b050fdbb551d15caa725dfa64a60750b02fdec4f76403b70b7413896f42f7d8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1573D 10500 bytes

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