Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a46fc93b09225d…

MALICIOUS

PDF

84.4 KB Created: 2021-05-24 14:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84d628c852fd5c5dd2c959c7215dff51 SHA-1: 56c03578775215b2ad7c48446e99a71e5a9e82f1 SHA-256: 38a46fc93b09225d864e2fc4614be35433c5f4927e9529a6fbe36b22d7eb8d5f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially 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 an attempt to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/8e6963173408dc3565cbd027f276f221/gawapowavulejulilopo.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9181d4265894057741f5922657cb6201/susimepotamevamixonod.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0ff72ba43c6cd575d29e03d7c9779061/46012857151.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/r0ah1brhd0k45nklrdo6v78ftc/22321920452.pdf
    • http://dzbnf.com/upload/file/%5C/novesegijuvivimifulud.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5ab988a868240dddeb89a268f319a81b/51651848554.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/vg8vu5o6df134auvp61jbuqshj/54200426901.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a88180bbaa6---dilelodumilunemijazijipen.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/e7fd02e5f53f532da8fcb64adc7cdc25/58125965947.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/teziritipudas.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089448f04b18---9630618323.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160889534d33c7---vojegitidamubi.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071d10666a86---90131177791.pdf
    • https://agentcctv.com/userfiles/file/40707079106.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/tbau016to8megg2a69jud3mbco/kenifa.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/hgl3aa0690e24jvbd2m1e23h7r/mijaxomodudul.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/db0cbda8f19a13e62d1f36a5c4917233/dudubukavewapexaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+basic+assumption+behind+value-based+pricing
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a9a.bin
cb8137cdafb2a1d8369e31b5e1d9a0f57ab7f538d9f1536e3134dc53ab7e71d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 5732 bytes
font_01_sfnt_off00011e05.bin
09baaa544bf11eba578d6d1f17447eadac8431eaab3b849f8c728588288f2285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 11124 bytes

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