Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26daa5134707775…

MALICIOUS

PDF

91.7 KB Created: 2021-08-12 17:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0515b03960f0094cc5df8922cbd5b68f SHA-1: 94c0a0659e16bcef1da92ddaff262cb3e24fd805 SHA-256: e26daa51347077752ef8ad0e565d82441d47f4851ecb46ca5243feffd4abee7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple PDF files hosted on various domains, many of which appear to be compromised CMS installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to download and open additional malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jiangsutravel.kr/userfiles/files/20210607_015545.pdf In PDF document text
    • http://raegcafe.com/uploads/files/4812956309.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/r875821ealkve54f00i4da4qs7/kilewiwulebebepibut.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65c8041a96---18266375661.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/2882686260.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/10048951307.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/a5j8jh4nms2qftu6t7ih1gev57/solomafesumikorilevidu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d498021e8---41782434099.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/48664755889.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/rilenosodaxavubudaw.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b726b37ab70---seranivufabo.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/86978321328.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/bigegela.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a29eb98d4e---labebom.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b82dea34f4---24672084423.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9caf3adfd4---fodijuzobixibepi.pdfIn PDF document text
    • https://plasy.com/uploads/file/zetiduposobixasoro.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31cc0c424e---vatelobutenadoranamitigom.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/91309301235.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/39242431735.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/pawobixefukigeriwule.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/xibarivukelamegejo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160893582abe8a---vomisejafinidikegozov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=vikings+season+2+episode+5PDF 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_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 18632 bytes
SHA-256: 52b744544c5d68952a7d01a27b25fd63b2efb312693c70d53d07cc8689f04f93
font_01_sfnt_off00012f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F96 10636 bytes
SHA-256: c419fe20617d92af2684db115a2ddb6c664f1914530e165b2276e73b8c37f014
font_02_sfnt_off000147ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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