Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0481eb946c75cbb…

MALICIOUS

PDF

72.1 KB Created: 2021-09-08 16:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0179096b917b0192458c25fbd26f5b4c SHA-1: 4f9e2697382f4c533a1d24cc43704270c6dc0bf4 SHA-256: d0481eb946c75cbb553d5cb6025870b902b42591807eace7ad88011c488f79fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://suliaok.com/v15/Upload/file/202192527451122.pdf In PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/29505051995.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/85387220462.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210902033351.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/21008c8032d25f4003f6a38908e87ee1/79084556718.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/32090952071.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/rofuxizijoziwem.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/taxakorogozunuwigumumalu.pdfIn PDF document text
    • https://izometal.net/mm/file/84514197512.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-7/20210907100005479231.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/80071357613.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/9929899789.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/87238648028.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/pajoxomulasodegu.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/jomobegazovol.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134085ab6b07---wobamaminage.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/88398077658.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342fc62dd6b---12913416198.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/8981c095a2008dd64085dfa51a548db2.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/takonigikejuziribopero.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385f0222669---25199405776.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/60689658641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=motor+winding+data+calculation+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_off0000b7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF8 16472 bytes
SHA-256: 70fc76b8a05b7d01f8040c4dad3244d952df9b8be3fcbb0168b6cfc90529f2cf
font_02_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 10672 bytes
SHA-256: c17514ff38c42a539628959ca7d450c3ac8f4496c24e78c56d81b9e53c823072