Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbbbde323e0cda4…

MALICIOUS

PDF

90.3 KB Created: 2021-08-13 11:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 054ddd87afaad017f02c7cbb8cdca0fc SHA-1: c5b65ec012025f5f8d3cf75fedfd0f276c8bacb5 SHA-256: 8dbbbde323e0cda41139fe132333988f40d803f7c56d3d0dddf45023ba675b0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, designed to trick users into downloading further malicious content. The presence of a link farm and the use of keywords like 'excel sheet password remover free online' suggest a phishing or scam attempt. While no scripts were explicitly extracted, the nature of the link farm and the ML classifier's high confidence score indicate malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee8861b29---87949216415.pdf In PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/73478394419.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/23395608755.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/63041439224.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081121042620---dafaxokude.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf3e059058---27269537925.pdfIn PDF document text
    • http://recviem.ru/img/upload/fanuzirejiroj.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/42079915498.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/nexowa.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25f9e1cac7---nubezoxedidi.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6adb646fa4171c74815e6f8ffcc50735/bedukemoperavapire.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e39a899b8d---6322100234.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/zokidorubuxilunoviw.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5eb846be---puxewaridob.pdfIn PDF document text
    • https://soechi.com/userfiles/file/44069357803.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/dufakusakuzoxogizus.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/29198332479.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/91410820519.pdfIn PDF document text
    • https://etadelloro.it/images/file/68999365532.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/7716400312.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/vinodabami.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd275a44c---xobubijebadomirobomufikur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=excel+sheet+password+remover+free+onlinePDF 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_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 17420 bytes
SHA-256: e1aafaba64aa80482494a8b14f7c29998777f75efa5ad388740480bd750eae01
font_01_sfnt_off000129af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AF 11120 bytes
SHA-256: ea55c0d251956c730174452f937f9a410ad9cb07bfb7c3e21023794e2ed07fa9
font_02_sfnt_off00014390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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