Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6db9287d449d8a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-06 07:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 610bf57852180ea729cd72072ec8ebf1 SHA-1: a882b3b85aac11364742920aecaee1985b28c947 SHA-256: 5a6db9287d449d8a96618d34dca175d8640b50f9e1553c3c1555aedeb9e31fd7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. This suggests a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80e238e41---wekizajadobukodupebexezu.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160809f2e02192---fasaravaneguxi.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/24346652892.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ma6igeeltc37qq8t9bfsa88qlq/2667051343.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074573ce2f53---fezixug.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/rufuliginogi.pdfIn PDF document text
    • http://esangsok.com/upfile/files/35672082195.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608208a509377---zuwiju.pdfIn PDF document text
    • http://amdind.com/userfiles/file/sojerokeroretewunu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/42f34e7e54fb2c4df582a7162b4673c2/97553949225.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/nuvikaxibuturirimazuvifof.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qe88fqa85vriog66905ibcatgt/56287032427.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/63701580146.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/gegasosewivifigod.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/n14n5q0hujtv7lp7t55aq9jfr2/wamos.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16095318a7d2e8---35760369792.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/16400666459.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/susinepizuwevopotiduwibu.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/96092378033.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/j7u139u1kjk3nos07t7hku6qk9/90892126174.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/g20o317s950n4bqt4e4m6mj90k/37103740511.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3bfe914b2---28689400340.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906985316fa---torewifezumidadub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=blessed+be+your+name+chords+pdf+dPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b6378d6a1510e849b993acf6b3a119db/rizijonejotafili.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_off0000c911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC911 17440 bytes
SHA-256: 3afede77f6863ef99239796b14fb36ce3676400ec3d23709208381519f712027
font_01_sfnt_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 11100 bytes
SHA-256: 89c032b2d2c8ec1f62598508fad48a3499df29a41ad0ed882499ae5522d9d503
font_02_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1