Malicious PDF — malware analysis report

Static analysis result for SHA-256 01053d1ad816d492…

MALICIOUS

PDF

89.4 KB Created: 2021-09-15 10:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d0a91200ebb99a135c0b914276e39b1 SHA-1: f08a20ed4248c49bff0e85f14929c9baa55dcac0 SHA-256: 01053d1ad816d4922743b41d6265671de0b5cbbaa05681461a7fc4581ad180cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://infrive.ru/uplcv?utm_term=watch+a+beautiful+day+in+the+neighborhood+full+movie+free PDF link annotation
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132550bc526e---vazosigifu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc06af0601---59181754650.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/88a81de56da653ca2ccf0abe09e5b83e/javinosoxuxovalobuna.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161363bc5641ca---posavojufujutajafuweki.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614154c62742c---gagetezejek.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/kapigu.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/26521092857.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/kodoned.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/57385922907.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3c76114a8---68679619271.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/40161870130.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/76144170569.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/seletubavorexofefoguru.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/dafuladuwozofa.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0f19066cdad0f3cc225394ed23e75de0/53396410513.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/66669934197.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090314570773499.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/zepaxurazorifipoz.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/2753989096.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/woxizonezogavi.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/fasenasejajofugulizan.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e8381be9---fisubaxiwejogarifofuloted.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_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 17520 bytes
SHA-256: 7c2052d22108cdcdd02957e9e6abe57d0451558625fe003c94c871fab33214d4
font_02_sfnt_off00013d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7E 11168 bytes
SHA-256: 75ff025595ac3ddb3d9e0c014aab77c12b230abf795b7679e44d048182200251

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