Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8a185b3d014e36…

MALICIOUS

PDF

86.0 KB Created: 2021-08-18 04:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dcb2efc652fcd078265e7ef417a2da08 SHA-1: 4fb0bb4410e03ad63580ec5839702e072912d7aa SHA-256: 2c8a185b3d014e364169cf0e179c53d14327c475420a2234771374f656198287
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, which in turn host further malicious PDFs. The primary attack pattern involves directing users to these compromised sites, likely to trick them into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/53nm4qs26v9io9bd6qkjouu6ql/difelazawedirupo.pdf In PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/ef3e3a3234dddf85b1e1cf6ceb4b10e6/71141445912.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/915fe1cfb63ec1195caa2638642526dc/nipukogewisetev.pdfIn PDF document text
    • https://webmenuplus.com/images/file/88394616523.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9d6029674a5999eed761e726100ae432/83380880158.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/38094733451.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/56686840405.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/puxezosot.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021081204000911.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/40777127789.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80798fef7---27875523001.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42713312f---94255484881.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/p0s268f2pit14sc7ccll79kjtu/zidiligobuwo.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9cdd130ad---19138885812.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/a1222603fba18b568e6fb469706e6184/papotoguluken.pdfIn PDF document text
    • https://binhvi.com/upload/files/xowexolisa.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4a06ad3bb0f0c84d29f140d0154a8aac/30445403903.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/69982729939.pdfIn PDF document text
    • https://ahha.az/userfiles/file/pudutoxujokix.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/wezovinezavobax.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/resav.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/zagogiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=validar+rfc+persona+moral+y+fisica+javascriptPDF 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_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 11060 bytes
SHA-256: 6c44b23935f6a4c15ad9a9a5c3015b3aa64d1491d6c6d8f8b0608a300a4e2fd2
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 19052 bytes
SHA-256: 410d8a502bca62f48f164956a93689b16ce751579b7e1f058574571b46a26c89

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