Malicious PDF — malware analysis report

Static analysis result for SHA-256 daeb28b03214f655…

MALICIOUS

PDF

83.1 KB Created: 2021-08-23 10:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a1eacd48c814b0ddef51c0426e9cc45 SHA-1: f4f0361bb7ab2f5db8e041db98f088d446ed4e89 SHA-256: daeb28b03214f65579b2e8007a2071307205cf2713792cde95c958486c634e66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious or phishing content. No scripts were extracted from this sample, but the presence of external URIs and the link farm structure indicate a likely phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/050d68344d3a4f4d361d121500971abc/29717010454.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec519c8c595---gukidisaxa.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/74722782403.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/12280581183.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/94411189617.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/76747861844.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d2043b9e---5896312998.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/miwokigokabasogokekukep.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/nedinomudojanuzu.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/84503810360.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b36840ad6aa---jifezawuw.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160adad1dad75c---94656968381.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/58117224492.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/53176135314.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/82636e60ec4749abb66c5fd952d017c0/27310751919.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160929acaddcb8---92709579569.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/kotigopojewono.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/16481570385.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13896383679.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/kobazovimesefelowom.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/44018796722.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/letowisonedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=introductory+plant+biology+pdfPDF 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_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 10800 bytes
SHA-256: 109ec2a71fffd0312371bdb8223709b85ab4f6320954c4338c9340ef2d466c4e
font_02_sfnt_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 16732 bytes
SHA-256: f21d60e12c08e7584d27d3b3464252bfb4a9ef609c83bf04bd7446662aa456ef

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