Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3cc84218926ef9…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 08:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 20b7dc24c471bc567851d7fbdaa86ccb SHA-1: eb0e71b76dc25da0feb7033498a59ecccd8c57ed SHA-256: 8d3cc84218926ef9e5fb89e7a697fd0f31ec3512df73a611776930d8af1d5b02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to phishing pages or download further malware. The presence of external URIs and link farm heuristics strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=october+november+2019+calendar+pdf PDF link annotation
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ced0d6fd7---nukopazes.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ddf59ce6b9dcdd27c9c4179dcb8884b1/83228544150.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aae1e2989---zinotafujitoboxakezogozan.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j3u7h3qgbh098uglvqn8lnivp5/89714200337.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xokutewujafalizapageron.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/37938263329.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/72467838391.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/26502500161.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/678170f5b16e4a73b6b251180a4b656a/kenol.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4993ab79be211b56ee6dfb4dd90bd9f2/gurane.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5af45e610c0f1f1e9321e320a5304718/11989683588.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/saxesokozusi.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/kimidifexuzeg.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/24190158336.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/66303258297.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd11a68c32---morazoxaxalotitonezejexa.pdfIn PDF document text
    • http://dgjst.com/upfile/file/mesikojugub.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d5b0a38188ffcbd10af65d4e6b8fc38c/76966005329.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/xasunifuwaxalesejixusu.pdfIn PDF document text
    • http://falerisztika.hu/tmp/78700869189.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c3826df6---19259896338.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/pavev.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3436131285---21961780252.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_off0000c0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F3 11212 bytes
SHA-256: 7f07f5faad83e12577c24b28b85891a9acc245bb3ac7e025eeb3a6db1bc7b07c
font_01_sfnt_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 15920 bytes
SHA-256: 73600c14f4404a9fb4e188d49e4d29e02d182ea3418e705841e8033be84ebb37

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