Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9958f91ee45d246…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 05:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48ab665a09e9af1610bfef62b56de301 SHA-1: 2de961660382bd630124a14e78ab462d09a695f0 SHA-256: c9958f91ee45d246cbd212817bcf74c2191144b1cac6cddfd49a124a31cfac2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The heuristic firings for 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a link farm designed to host or redirect to malicious files. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160864c8737a04---18161743264.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/54b07c7b28a6ac39021e3c871db55db8/37267093189.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/ligonu.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/20478365722.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/ruparerosikulisodino.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7d1355fb3---12435979807.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d27e88dbe38cce41615517934f9b5b91/47752079541.pdfIn PDF document text
    • http://119pump.net/d/files/noxoxosed.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/749a7b82c4c710f74a76efe038c594f0/gaxaturefulug.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0e9182002---revuzejozokibapizimefew.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/givodawofinejusavig.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/46911908135.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/62883961067.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/45729324e14ce2d66ea34e5c7dabbc1f/90770864821.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/riviworuzuzaf.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/sikaburetug.pdfIn PDF document text
    • http://dnepropress.net/files/file/55901797533.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/18139027370.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/78567737305.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ntf1ufensf4hcb6024002g1l00/zefekilomogavazoz.pdfIn PDF document text
    • http://zxsolar.com/d/files/woxezukutirow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+1+dragon+city+modPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/nazenese.pdfIn PDF document text
    • 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_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 10512 bytes
SHA-256: 35ddb4e2d281bf1bcbc2710213d665f84a3cb108a391c63b45d34d0c4b4e1d2f
font_01_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 17672 bytes
SHA-256: 71690192c2e250078920aca4be15001d2c7036f779a130884d3c7791b924d0a5
font_02_sfnt_off0001217c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1