Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea74958592e4afd…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 17:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca9df28713549439afc8be2915163ac9 SHA-1: 0ff51772541fd44e9046e601cfa0d3e111f135c6 SHA-256: cea74958592e4afdbaa517b60fa2700b92b669b3a6441ca04c6aead2bcc6c0c4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to domains associated with compromised content management systems or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=slow+violence+and+the+environmentalism+of+the+poor+pdf PDF link annotation
    • https://hanyauntuktesting.com/contents/files/pokif.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdecc20414---78250595215.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/livivurojiwiran.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/gixugigibede.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9vgko28oflp9pads6284pkkkd4/84251673225.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/28955051095.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/79205431059.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085846f631e6---65168151341.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849ccf8f2ad---3314225869.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/bipodegudesopurevudal.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/81030173464.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/pofikerudabe.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/ditunaxivedefizo.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/tagidoteloborubuxozekoj.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/af3c3e243a29bf469ebbd3fea90b5696/52400450461.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/mowedebinusofurusuf.pdfIn PDF document text
    • http://rotang.net/userfiles/file/98565178796.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/94088398631.pdfIn PDF document text
    • https://architektor.ru/uploads/file/nebovujusowesolimumufuxow.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/41921494006.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210819004353.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c3b7b3d3d5f66a5f3d876318c35b20ad/sefifobovo.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/kuvuwudufuxakiwafi.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_off0000c889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 11112 bytes
SHA-256: 1c6e583bba1e1d4ca343f5ba43c9547fd2b35e397493276091bcaa31b1023645
font_01_sfnt_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 17264 bytes
SHA-256: 5309ad364f595cb5c99fd96b78185e688fea0b7c6716134e2b57d5fdb2bba806