Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfd36f5f05c3d26…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 02:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a48b2ee5b4e35e7b96fc7dd3c1c4105 SHA-1: b1daee94ff346c4fff5e21e22628dd3781f51f81 SHA-256: ebfd36f5f05c3d2677f6090d7cb1c59bfdf31ebcf64a946f98f58cc648574882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of PDF-specific heuristics indicates it leverages PDF features to achieve its malicious goals, likely by redirecting users to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=midnight+the+stars+and+you+sheet+music+pdf PDF link annotation
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/4ba9428e255562edd2ce3bc4d31bcf8a/90632946385.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2bc8c5731767fa3a7c173f7154741bfb/tazuzadipogegoteja.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/kopesapiwumoj.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a528558f6e3---74957589568.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/40751532224.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qdr5tkekoum6umiir5q5e2vj97/70803881648.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4fdq62ml02ahbm6q6ueiogbdht/80109803703.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/mekaselizima.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610563bb0f29b---35445903626.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/56459140994.pdfIn PDF document text
    • http://epicridesnepal.com/files/48524765614.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/dotiwemakexadudatas.pdfIn PDF document text
    • http://usmleworkout.com/files/file/48671202305.pdfIn PDF document text
    • http://clingac.com/d/files/67589053093.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d43923b1038725cdacfd9721d38ccb21/62202052428.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/mejudosakazunivat.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38f8d7613---sowedajojomesorikutok.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/63095111581.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/12e3d55826a7cf4f1cb8311a12a734fc/voginosozuju.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/62119328708.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/355376022.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d45d1b8777c4146fc94e2474ded8de4d/93857742418.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/0f4522614abfd4f1cdf3bd1fbe53d27f/47920488077.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f708570e6faa40f3ef7d140a7f1856bc/45097317122.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/kawobenilifefogopezu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 11228 bytes
SHA-256: b5841e3a856ad3b33bb9b58d2fa2711a466100bf2ab86cfc97da609f06cab3b5
font_02_sfnt_off0001187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 19436 bytes
SHA-256: 30997f0a07860aa29bf3bd447a31abf5d22bb1b414ec560203565e0ef0df61a9

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