Malicious PDF — malware analysis report

Static analysis result for SHA-256 6225ef8c5f42e3cf…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 13:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f5c25efab2ee79c82e2d07115a35f4d0 SHA-1: af7028dc7cfb383f4da0d2f8e27bf0a952064419 SHA-256: 6225ef8c5f42e3cfa143ec99a010e3d3b3e26979e1072f2244d946c1a07fcd7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://regimhotelierbucuresti.com/images/userfiles/ziretojijovawonefe.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062613213653.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ade8c3edf---11085141864.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbeda7c0e---33257797580.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/mogaf.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/kokagojejab.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ca4c3fbb6---lupupivoruzakijewudon.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/24676138615.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee061b6fbe---jadetajifawejevogad.pdfIn PDF document text
    • https://peterdegendt.be/file/leboxukiratojipilanilu.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/60675816275.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/18187598810.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/surujuse.pdfIn PDF document text
    • http://fitviewer.biz/files/file/sovatutusuzuselenap.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/65929686603.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161012911c3610---gugekiwobunutitud.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/7qlr801k48bn4oqdeltslm1b47/29837863291.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/togigivevogafokopu.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/25680180132.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b61f7b165---67800917346.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/zojoxenumuzuvemati.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/fexebedulukofinison.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/41af8e7fba0ae8d03bf3ae25c95b8aa3/pijejemi.pdfIn PDF document text
    • https://ewt.cz/res/file/fulolanen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=embedded+system+report+summer+training+pdfPDF 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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 18012 bytes
SHA-256: d750a295823e64e09db3bc181f9ecc33b3f7c5aceb264d3ef7ef035c147ecff8
font_01_sfnt_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 11132 bytes
SHA-256: d8c3faf35585bf920a2fef5469c2483454cd3bf4bbe18a5b1e73c88c76b6891f
font_02_sfnt_off00012672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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