Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ad0225d38fe652…

MALICIOUS

PDF

84.6 KB Created: 2021-08-15 19:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6ff234f37f91b0871c15d4da9d1121e SHA-1: 16e3680d1b57c2e49605395c9a64619f3f644e9a SHA-256: 33ad0225d38fe652510e0183a69cf696d0a2c05d28a8d0a2cd4c6abf6f7fee5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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=financial+and+managerial+accounting+for+decision+makers+4th+edition+ebook PDF link annotation
    • http://meechoktoolmart.com/user_img/files/dopokawedu.pdfIn PDF document text
    • http://kids-ex.com/25386499689.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/lkclgel8bv0hqikjdvdvbj4458/mowigiragisoguleseb.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/52a8a1885603c21ab667411c2a82a35c/jesubozudipudegog.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/10265546035.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/df6b6293dc4fbdeec45cb02ef27ca7cd/rasuwupotanofitijafapode.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/46129821787.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/56284607555.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/dugisizemuwituwedobime.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/xevuwine.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4e27146b3---38247379859.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9290b9ca9097ca34ae0c4aeeb64f0bd5/gufuvulilisigi.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/22330136485.pdfIn PDF document text
    • http://grimastone.ru/files/fujoxogive.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/88148851557.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/pepunukujagi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/o49i2al2mevqau7moga6tk9h2e/jasemomajifevirej.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/25490872357.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bixaresafadeke.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/24048191784.pdfIn PDF document text
    • https://hiroyoung.com/data/files/jeniluwusedu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078113643f40---13069871395.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8775639ea---sijugopatafe.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/nivogute.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/98371688609.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e450b3ead10---niroladufawalafu.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f7838be39bbd45d122f19cadaacca1f1/37417215151.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_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 17100 bytes
SHA-256: 0b8a73fd593e596dd39aeab2be84f59adc2a677ce3c017135927a761dd53f524
font_02_sfnt_off000126f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F2 11312 bytes
SHA-256: 9daa6800f68320c328a82cbadfb7b95fbd75f771d668a0273281f8b36ca5c254

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