Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ad6ee24468a7fe…

MALICIOUS

PDF

84.9 KB Created: 2021-09-21 21:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9317f0fd355356faac0ff61e6c765cfa SHA-1: 105fce1e5c602810d44538668af2747552920f05 SHA-256: e7ad6ee24468a7fe1769b414f74b60897fec809d3159269f19bfbce90fb016d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd11dc0aca---21233736525.pdf In PDF document text
    • http://tpt.taipei/asset/uploads/files/41463348302.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/69020330583.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/45809599540.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/numomimozulobazoba.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/45415849923.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/zejubuxuwexaza.pdfIn PDF document text
    • http://innotack.com/userfiles/files/44329916021.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/3323645325.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/xiwopujuzubi.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f9e282ee---48281072549.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/92557524387.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/lawerozafipodifi.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/devebaduk.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/14617785014.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161396f2ac14a5---fopeduterogetavesatine.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/jutuwa.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9v16kghp49ppkiq3qlv5ttsqtr/doboten.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/tadopebopazitolorub.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/90645154194.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631933949.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f30c785ef7---mevisowezoxafeji.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109120919523808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=can+the+kindle+app+read+to+you+on+androidPDF 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_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 10656 bytes
SHA-256: 973ad920640ee9e9bbd93e230166014ab617536086d7cb42bfabbd33f2e21649
font_01_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 17564 bytes
SHA-256: c7a5cfb04b3768a4e3d00d56b00bc53ba1b649185c3d766904aa71efe69590d5