Malicious PDF — malware analysis report

Static analysis result for SHA-256 de461486a1613128…

MALICIOUS

PDF

71.5 KB Created: 2021-07-02 23:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f23196583202e91a5c608f20d5049b6 SHA-1: fe749c9719cba698fc77b417cc63150f6792b8a5 SHA-256: de461486a1613128a02d132f4774d519ba123d69f866ab763692ae15f4b60116
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for credentials. The presence of JavaScript indicates an intent to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wksystems.net/HotelEstimator/userfiles/file/23030345372.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160788609ca96e---sodiverebop.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b2f1c248c---vuwenal.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/roxuwi.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/81710396487.pdfIn PDF document text
    • https://latework.cz/soubory/zulod.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ks241ha81dirq10s3sui961n1g/43042779783.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e187d89870---38646759126.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/65404033903.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab509e60611---xawotitesexomewonufalupo.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/72026869925.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/45949004427.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/q8h42sp6j6ad3qnv3d2g5jja07/86246126325.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/2186223965.pdfIn PDF document text
    • http://iphysiology.ru/upload/1076131839.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2f5f8f02338d7d5299a953ebbf34887a/fipijexox.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/jenibuzipobezikonupato.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12bc8d43d---fugejusegirimulirokedopat.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba5bb17b72---88251200676.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd11d28d9---7749605859.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/xipojokebevupimubix.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f794c2fa23---fexatun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=2000+tundra+owners+manualPDF 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_off0000b82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82E 15624 bytes
SHA-256: 872c5c03c4663717fd37260e40fe78825a7469b00974cff7491cc49d9fda6453
font_01_sfnt_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 10648 bytes
SHA-256: d9172f3fca82ea69fb988cca466f47a2e192072cec2ebfe724ee4f99d321c6b0