Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bb2d929398c423…

MALICIOUS

PDF

89.8 KB Created: 2021-09-07 18:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a4dfb892fbf64ae2c3e763e4733b0bb SHA-1: b7a832f21f712e445d5a3d83549daadbaa42da49 SHA-256: 42bb2d929398c423836cf6abd424384fd0ac2a3d0da5916990e1026ddba1d689
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload via the provided links. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd83945438---22022742503.pdf In PDF document text
    • https://dienlanhbachkhoa.info/upload/files/36833245009.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gu1s4aqtko42e2majrp62g0g6o/nirevibutozirifasegilip.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3610fa4e02537a68a79935133f522f07/jomozosuwujezemi.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/rugifawomupabolakabi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306926a5778---zizasenuxufarekovanazot.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/sizidugelirot.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606f519d3b31b---12493389469.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/mezonet.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160960403232ed---garanebo.pdfIn PDF document text
    • http://kimthienbao.com/userfiles/file/84329738620.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/pugetebezano.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/69094185644.pdfIn PDF document text
    • https://subarini.ro/mm/file/19145033423.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65bf23bc37---ridoki.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/17050594842.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/42li6svovv2achnkvv1ejd2bv2/lamixejupepoda.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c06c4aff---sedagezibutara.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/16780499705.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/gegidetariroziwife.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pplbo4sngaitdkc8pbrt9jifrg/xarekowavaku.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/kinutukasuxodokujoroji.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/zikufezoxugapefidubulanej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=midas+m32+manual+portuguesPDF 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_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 17512 bytes
SHA-256: 3d36f1645faf2cecc9354f72b3768ccafffbf0865baab1919fd253d2ce43c3bf
font_01_sfnt_off00012788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12788 11120 bytes
SHA-256: a0f20cc2475980fd9a9ad0598c1a42aa6f80a1c9770715cb32b5856a1b2e1053
font_02_sfnt_off0001414f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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