Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66f9d35aa0d4808…

MALICIOUS

PDF

88.2 KB Created: 2021-06-27 12:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00b66ab3e4ad0e682ac27b9b80a1b64d SHA-1: 7a7486b0b6ed1eb71624cc995c2bf868914f5d01 SHA-256: e66f9d35aa0d48087a8ce363ae725e1638bcc24721a6772954736c317c3fc1d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple distinct hosts and the nature of the URLs suggest a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ib0ei49ra8edjolvkensujdiud/54404029032.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079337b057ae---wuzuponomuwefuduzavomaduj.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10787ac20---972702347.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/163aef514016e434e0cc10e8cd209675/bonezavibab.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c22917610aed52e6da359bd485bdfb94/14866937643.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/dofasak.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58485f0c63---tebonogetafixogarebowij.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b41c2034---gazaxisekiluloleleda.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aca168bfa8e---mewunifapenuvexo.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/29655466761.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/c9ovofha90aapfifmg27m912o6/93063716238.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7027d5f1ce2261b3f888eb0a7d8617e1/67408461818.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/11563c40841db7c381f42bbeb176ecc7/35686347378.pdf
    • http://digivideos.net/ckfinder/userfiles/files/75163562251.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/oshjaqc8p1igfjqpjjnt0iqfo8/158415429.pdf
    • http://www.urbanwaterways.info/files/56031566471.pdf
    • http://sunrui-ti.com/d/files/9101327976.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e877a59f34---95265165851.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/17087563e7f0ca0e40e590af0c0f9fda/digutogajowubufuxupowo.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7df982f3f---xuvakula.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0019b3ed12729ee41525f1cf5b2b553b/nowenidibefuwekora.pdf
    • https://nbtele.com/en/cache/fck_files/file/dikajobebabobukufefa.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/fobidiwagotizomamidowet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=reese+witherspoon+chicken+pot+pie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f58e.bin
4ef1823bd2d6000242a4b3158783de3e3dad602589b917f36574bd719e98e991		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 17520 bytes
font_01_sfnt_off000123b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 16792 bytes
font_02_sfnt_off00013bcc.bin
8aeff5fffffb3955fa0464b7df8faef2ed9cf69a0b68a9229f3e2ebd47f13952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCC 10484 bytes

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