Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf47c48e4f0f4d98…

MALICIOUS

PDF

69.4 KB Created: 2021-09-13 04:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6462f1b86256013937a45feb273f40cb SHA-1: ead82432fa70a7ac5029eb57bfb1c4a1fa4bbc29 SHA-256: bf47c48e4f0f4d98cba4172ee84406ff206e3df89cbeb2da74e85dbcd8477b8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users to download sites. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://fminterativa.net/cms/plugins/ckfinder/userfiles/files/kolibo.pdf In PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/tativ.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e644184f5---47870442854.pdfIn PDF document text
    • http://opsir.eu/files/file/givukewegagelowesumesowoz.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/66079057746.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210912_210452.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/16814010471.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/turukur.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/jemofuzenuzakubaze.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613126a63ddac---fozunetuvekevujerewuw.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/17090587967.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090221131986.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/87419583030.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/pitagetirakoved.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314ce82248e---zuwosiw.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/voretulu.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/49669396240.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/86963112017.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/51724013067.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314c2ca30d2---xibexikirawusitakagavopev.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/11949471871.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/pikepobov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+fx+master+pro+apkPDF 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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 14356 bytes
SHA-256: fbd51e9069c3c014e8911c369aee3c598d91caad4dcc73eebfde8fb9a16419a8
font_01_sfnt_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 10848 bytes
SHA-256: d3f6be6abad8c3d14b8974c08cf0eca56c2542ba0603b554e8c7f7e709a339e8