Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee89343fb33aba6b…

MALICIOUS

PDF

86.9 KB Created: 2021-08-14 18:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 281951c1a54f8b4d7df86fab46650022 SHA-1: 558b4e5c7ddec9ad1289fbc2115a52695682a801 SHA-256: ee89343fb33aba6b2b58af9be19e471dda8d2e51c54c024ab3c8a2f3cf11e447
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://iqmuseum.mn/uploads/files/wajegopidimuniriwemipur.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3688db4c---12389739561.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/zivujidu.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/fopiritefipuku.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d66eb81a4b---19202685236.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/77087766271.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/soxomafofuwitifuzofakuga.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/09210716439.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/49644593978.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4ffef0e4e---62361789464.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16083e6c4a716f---59595767750.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/68a5b7243569cc84406ee8818bc1d74e/zanividem.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983dc2bd141---24026048869.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/sazejelaxizabakija.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5daa88a6---ruvojotikuseluredilezagud.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/dupaxinar.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/pazonaxejuzi.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/damejelatot.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b98f0e06ad5a73f3b42a927c3219403d/soziwijutajukeruw.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee08191959---73909528457.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/dagagixitujupedabiderasi.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/53259887930.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/reguwobezizi.pdfIn PDF document text
    • http://tianfonmm.com/d/files/revabulexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+way+to+fix+a+jammed+shredderPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8992bc560a---61874685568.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_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 16968 bytes
SHA-256: 6b6af2601a1ef48560706053d703504f05e99996bd5bc36415651cbbf624a439
font_02_sfnt_off0001349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 10956 bytes
SHA-256: 3c1e2be96500acb288b2bb9f529e5b38f75f2164b63e1e80be3c522028cf4e21