Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf8c669d8d1fe63…

MALICIOUS

PDF

73.0 KB Created: 2021-09-14 10:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a967cb84b581d521b252809ee218ffc SHA-1: 846bbe0c7607dce75c24628e91ac9be9f0aee617 SHA-256: fdf8c669d8d1fe63ae39044d14d888fb13d061931a2d6b20bdca4c52a3cc7fa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common technique for phishing or distributing malware. Several heuristics indicate this behavior, including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the primary attack pattern involves redirecting users through these links, likely to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://iscyber.com/userfiles/files/50904521573.pdf In PDF document text
    • http://doktor-okonski.pl/uploadimg/file/tavanalexuditib.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/91152851837.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/sofegigidufogesixalebibu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e51c3026---jojekisoligazavuw.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/tamenujivojixetukowe.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/zodafaxonujusazo.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/88778362226.pdfIn PDF document text
    • http://okvin.org/userfiles/file/66337436472.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/21824788165.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090204042573499.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210912061826.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/jowuveku.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/92280204521.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfc227ea0---pegamojun.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/12235384747.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/demamakefabubajubazil.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/jedep.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/568639017.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/91583287846.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4656b0571---55616492323.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77377953875.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/36441786382.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/86051651024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=secrets+of+the+sun+king+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_off0000bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 10960 bytes
SHA-256: dece5aee2b7a5da3ebccd1cb36ff2cb6bf0bfe2584ac541d9cd8375bc4e53f69
font_02_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 15996 bytes
SHA-256: 5e3e7e668be85695a1ea3cc3a93a0458775d68e472a20550c757ceb40a095b71

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