Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb42bb5592cf311…

MALICIOUS

PDF

94.2 KB Created: 2021-09-02 10:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9cce1456d4bea5647c9aa9899d19d54b SHA-1: 5e385e3cbf05b8701a5bf65ea58f88c06f728933 SHA-256: ddb42bb5592cf311f84495923caef1bce7ff4beb6d7cbfc2d3f9e2c9204ad7f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and an ML classifier also flagged it as malicious. The primary attack pattern involves luring users to external sites via a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855ba7cb7e6---12064418447.pdf In PDF document text
    • https://projektovanje.info/userfiles/file/toxaviloda.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/hqpsa4nqcmjc350u4000de25eu/93533511298.pdfIn PDF document text
    • http://cascad-trans.ru/files/43195898830.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607071b55a361---54492095096.pdfIn PDF document text
    • http://winso.tw/userfiles/file/nuzopesoda.pdfIn PDF document text
    • http://cvsc.co/userfiles/file/fizegusogajadugenapoba.pdfIn PDF document text
    • http://adveotec.com/img/file/xaritaxufesusuduvegiwid.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/xiruwezop.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///455763484.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b580674a8d1---sopawapora.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/98540272570.pdfIn PDF document text
    • https://aneri12.eu/res/file/rubizeva.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/jugodabavoz.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0737c86945---46417830845.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/d39cb8e17bae34915053b33e3053f10c/29813860720.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/bozulexufugu.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/67924594403.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/86300669113.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/59221635260.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/53076476569.pdfIn PDF document text
    • http://hzqzg.com/d/files/fabizexen.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/34178023271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=alvin+and+the+chipmunks+season+2+episode+24PDF 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_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001219f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219F 17940 bytes
SHA-256: 93b4d6d6017fb5692022578c548afc08385f7c0d69cb4c28cc58bf6b65dca6ed
font_02_sfnt_off000150bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BF 11116 bytes
SHA-256: ca5a26e50a00818d2d6dbd6e573ca24c1f0f96ceaa2493120db24b2f42053ef0

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