Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4766c9db3e0590…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 19:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92753be8c2f12a1bab0872fd2b9bc23d SHA-1: 2d9f311422ff360125d64ee7393c3b510caecd14 SHA-256: ce4766c9db3e05902485f606abdadf5a4920d4f342e7279b75fc68e450d46f9a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, suggesting it serves as a container for these malicious links rather than providing user-facing content.

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 http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5bf51ae07---felerebawel.pdf In PDF document text
    • http://somsit.com/ckfinder/userfiles/files/tixakazukojesupevov.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ukrafo0v9hqn42m3pefv21jia3/numimenod.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7c64ce3f0---moresakupamotitivabunosi.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/telos.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621174083.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/67431756947.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/mapiwatamowutatuzid.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/riroj.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0f099594a05ff7c6dd391cae808b15b0/lulufubu.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/jivosiroxiti.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/250047279789.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3160010c---24861623138.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/25465160235.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/24017118357.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jtknscjabhb707ou2bhhuss2mk/pudimesaferegumakevos.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090cea8e2721---leziseginufivogejovewe.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/50564358599.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/20baae83bf8881bb06b15520cabd7f0f/27641429714.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ch1q7843bof0o085476akv76kr/146364528.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/80344983931.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20301296864.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/22d83980e871a8b1be1ce9142928858b/35494114080.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/66155085013.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cbd8212f5---43397954542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=diy+pocket+hole+jig+pdfPDF link annotation
    • 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_off0000e0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 10700 bytes
SHA-256: fc7b68c9e8b2574a9fe5f8262d7d522a7801626498c7f390775d0b8a820d17c6
font_02_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 18352 bytes
SHA-256: dee7e2cb8f8938d26e7c304eeb504a356a2a917c70c67fea84616e13a16dc020

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