Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66b7266d935f5de…

MALICIOUS

PDF

95.1 KB Created: 2021-07-16 02:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6abe6b24501f9d4b310c96f4178fb0e SHA-1: db53ef3f7149e875eca94e96dd26fb5933eb580a SHA-256: f66b7266d935f5de0e3005878144d7812ce8d13767726696e3ab17be07b06a6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for initiating malicious actions within PDFs. The PDF also features a link farm pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack where the initial PDF acts as a lure or dropper, redirecting users to further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/93ed5ecfb32902b5c00f797ec91f73a8/vezusatabifedur.pdf In PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/1737cae1f56ca5becb64cb09f54771ae/fiminitixe.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o07bra0pc92eln4gms501l0pl0/89020793053.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/torovezejike.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s38fnnb7h7la522maqndp183pt/saxagupuw.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2t0ig7ff21tdb65dklkmies414/52880881746.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/45849119482.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b05ae8a1c---93627005001.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/92822041882.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/1170573643.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/84461430943.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1716138a---21591597030.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/jisegikekimolenawaso.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9jgj5jmvo7uo96k65ag6th2v06/bibegurewisixibezebanike.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7335e73cbaf66086f544efb28ccfe6a3/vamizekof.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/37964637435.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bf29rk3ajegfgjunkvsc5hb1m6/17344091901.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa726e07cf---supopuwedepawoxenirepo.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/glfrl6a8b1esqpni5truvc6g4v/52142478811.pdfIn PDF document text
    • http://novichiha.ru/pic/file/vovuvewoxose.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921e8368117---muwunajop.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb760aa278---60930122548.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/75021799829.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/eb7651de464ac5362907eb9bd6f13f06/muvetidugofotuzujamukep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=omegle+top+12+alternativesPDF 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_off00010efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFB 17408 bytes
SHA-256: 304121dfe3cafebd86bf5186a169403127d06a4242c8bfa513a0e50a66b10d0b
font_01_sfnt_off00013c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C90 10860 bytes
SHA-256: 9d56591f505fd89c4172882aae9e425682a3c7530a45d034e74e8608b9006a81
font_02_sfnt_off000155c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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