Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14ad69bf8b9daf0…

MALICIOUS

PDF

102.8 KB Created: 2021-08-15 06:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5fc094a192d892cab6d7d747c47377e6 SHA-1: 6e9c067f4e44ef40787e181c0279f3d88ebcaef0 SHA-256: f14ad69bf8b9daf0e082e1be257d16d3180061a83bfed67db2bdd959127d8a23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the overall structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%85%D8%A7%D9%8A%D9%86+%D9%83%D8%B1%D8%A7%D9%81%D8%AA+%D8%A7%D8%AE%D8%B1+%D8%A7%D8%B5%D8%AF%D8%A7%D8%B1+%D9%84%D9%84%D8%A7%D9%86%D8%AF%D8%B1%D9%88%D9%8A%D8%AF+%D9%85%D8%AC%D8%A7%D9%86%D8%A7 PDF link annotation
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f5c66100e4b1ef67950d0adf7c53da54/26778813401.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/30225983943.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa09f2622a---55254764658.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/wipowulip.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/39250794522.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/wegaru.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/55589593423.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/paruwexisosevuxis.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161077d7305cf2---rolaroxoduzos.pdfIn PDF document text
    • http://rld-carbon.ru/file/65775720777.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/85cafe3802189eefb99fa416433f5477/58932480582.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c05a0c25f---munafiwipajufoxe.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16112d10d36272---20171148516.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/30530649748.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/90ac534333efae79fcd72cf23bf04128/kubenowimejaxodibul.pdfIn PDF document text
    • https://purefeeling8.com/data/file/52571860481.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/rewalupobudepelijigopu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e5512bb1d6041f37cdf70bb2bbb9c324/34028057812.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/tafafuze.pdfIn PDF document text
    • https://edusfera.pl/upload/file/17759083681.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13501900241.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/9257134004.pdfIn PDF document text
    • https://bachson.net/upload/file/jopuru.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/48715234582.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b29d05de009d97e1d7fffeac0f7c4915/56600480876.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015261.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15261 31628 bytes
SHA-256: cf971e2871fac22bcceb0e595ef673cb72459c4b2eb47d0119708bd30f2e6c26
font_00_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 19404 bytes
SHA-256: ee9abc71f8a202f04bde0a40840401c9794d2a878b75e29511c80d2c8e762f73
font_01_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 14236 bytes
SHA-256: b976c25baf0d0abf1abf4ce1fcaa57250c8de4daacdcbc1e574cb3cd5e2f596d
font_02_sfnt_off00014036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14036 8984 bytes
SHA-256: 1155eef8b03fb48db8196c62fe92ea0367c3129ef5e52290f3da045cb9446085

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