Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb44cdd09f3e51f…

MALICIOUS

PDF

95.7 KB Created: 2021-06-29 05:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9562c37618770922acbdd9f462c65a3f SHA-1: 8338979561b6f4f4a964fb1bb660e753fc69e40c SHA-256: feb44cdd09f3e51f0103098632d0fde0ddceabd9e06d0f5aa1f159a4c36afcd9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://bangtaisay.com/uploads/userfiles/file/dunavevoliremowiguke.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1a6855bbe---jogavedot.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210624195221148.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5ku25s83vuijn6168sncudvois/7653531624.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/35185843190.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/loxifotobalagegarikudobu.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/niniso.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7344600fd1bf5582ce5d4cd2741827e7/lumemigewitubenuvuje.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/xaxegibi.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5f07901b4b530b4e9046034aa8f7c098/22375748779.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6024a45e3---gonenudafafalevi.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/wuwojenizogex.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079cddb47b1a---lorawuxobufa.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d96c506df7---78251730226.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/7653209896.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/1hik131uosb9ct23rrco58d06n/27842777174.pdfIn PDF document text
    • https://steammining.com/userfiles/file/wokodelebaz.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2fcfd8e2b---18961632890.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/29643451678.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67469ba79---gesafufoxujegak.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/21639505439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+respond+to+a+welcomePDF 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_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 10660 bytes
SHA-256: 655c4fbc2a16202f4f739d17f2124b4702c312e40669fe71420172cdc7ddbf66
font_01_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 17224 bytes
SHA-256: b3a244ff87392e2458bd8b3ab5272ba519591b3f6a1df09a87f0bdb9473e8c80
font_02_sfnt_off000157fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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