Malicious PDF — malware analysis report

Static analysis result for SHA-256 02fdcff657af337d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 16:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8b66428d1fdff61f7da88f81a4fe6f4 SHA-1: bfacdd910bd53c9b6d1a2305cf36182e9085188e SHA-256: 02fdcff657af337d6e9a0001fddb525aaa2688625489cba0b31027a598adb847
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 disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of a link farm and the use of compromised hosting suggest an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://free-note.kr/files/fckeditor/file/19494167706133d2b534b91.pdf In PDF document text
    • http://thepokewave.com/uploads/files/renuv.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4bfa12bf4---70332247825.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/74722785983.pdfIn PDF document text
    • http://cloverdiamond.com/file/zuzopilamu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/49208675179.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/nujebapo.pdfIn PDF document text
    • http://lobi.md/userfiles/file/74941313193.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9b12f48cee2e891826eed18edca1dde6/jokupirukupe.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/40559254120.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109121649091134.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/43529589594.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/xizap.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/dawivadoxidox.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v092smvvbcgqbc701n350gg527/ranufozag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3bb29b2d7---67406164241.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/nepotidebegutij.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/090848231590.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f282347ef---lolukesutafobipuk.pdfIn PDF document text
    • http://anindecor.pl/files/file/62744932796.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/gopemebametunitofixa.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/vibotig.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/84836d124d69606113e111d1aaafa228/kexuwubero.pdfIn PDF document text
    • http://warungmimpishio.com/contents/files/melexe.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/jibizukazajikedogofatoxuf.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/23623751998.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/41058075653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=get+more+insta+followers+freePDF 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_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 10500 bytes
SHA-256: c0a07db315a3ef7d65ab8afeac004bfec38cce60bb3476ee03bf413edc36cf48
font_01_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 17896 bytes
SHA-256: 58254c734cdff71b4385483d326162860027a052aac19ca9f8cd9e6615598133
font_02_sfnt_off00012c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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