Malicious PDF — malware analysis report

Static analysis result for SHA-256 333d483f7dbfc60a…

MALICIOUS

PDF

83.8 KB Created: 2021-08-31 04:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 610670815b6499c33d719eb43da554de SHA-1: ab4359d26e904940c332f7926626f7e1ee627fae SHA-256: 333d483f7dbfc60adf8c07d95d662a44f616043a7f5d61686a7513d3ab9314dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://giaoducvietnamtv.com/images/ckeditor/files/58936096364.pdf In PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd3d12720---lexoresagodemawezaneg.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/68746626860.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/53451764561.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f42f631e2---bajafogakena.pdfIn PDF document text
    • http://learningkey.org/userfiles/gigoregujarosevirom.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/bosiwevo.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/94830389402.pdfIn PDF document text
    • http://effektfilm.de/files/file/wanatarovuvepivigevawaxav.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/61431560871.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/66184057338.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f2db0b932c0609fc01db11303040b177/xusovi.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8e2d22b18463646011aac411d9a81f63/89051083672.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/6005142752.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/88767753827.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd3b41811---gitopotumobiwekokefija.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/tezemuwelobukevigajo.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608578b165b65---47040787077.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/tidujawuwopusa.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0688002a688a825dfef6205702dbb4a9/vuduresisonabifope.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/46ccae4324a5259daaf89caedfe07b0c/18972635335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=simple+drawing+pencil+shadingPDF 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_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 17104 bytes
SHA-256: d31572e927474a30c49a6d627eff8d4db9139aa5b4258dabfe73aa123e023162
font_01_sfnt_off000110d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 10904 bytes
SHA-256: fbb590180b5a9bfe65f3d18559e8081dc864a01c869e1c6bf7c372f09e165af8
font_02_sfnt_off000129a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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