Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8b06f734489a21…

MALICIOUS

PDF

82.1 KB Created: 2021-08-07 19:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8661546b6f125249604fd73292e4f6b5 SHA-1: 5c2d1d145da271df6b03e0aea2705f4c8ef51c77 SHA-256: 0d8b06f734489a21e48d9258b66af08d15e4fc2ee008cb0aafa6619971265e19
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious or phishing content. The presence of these links and the overall structure point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=how+to+cheat+in+dragon+city+mobile PDF link annotation
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/eubn3448ftp2ahk0iav868ca21/28913868174.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12966945e1---31375718934.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/90010096670.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e922113b86c---guzoxelolowepuwulafinibo.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/26397804071.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/lb2qfh1k1cctgcthardt78e8u6/bexexa.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ilfq67d7kuo3og64tf23sm5nq4/68573427391.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/76730775448.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8p8kvo4l9qgsjb4rjdqbl6j36b/jexijoxubibezine.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/65762736596.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a68ca28a429---76412100792.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/75ij5lsmo5s8gqiucfvrbc1nmi/51345425234.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/jabuz.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077276f780dc---79422617622.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210515064951_49421946.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fcfbd156b1e---25799216720.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7aa9e7e1b---84854094629.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/gekoletoti.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/85925903099.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/69162253930.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_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 17004 bytes
SHA-256: d69850182c95e0e3930dd3f9b7c109af25831aef8af4fdcae7ed132d6b57cc57
font_02_sfnt_off0001224f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 10980 bytes
SHA-256: 7208de28ff664aedf6d35ac9ee3a0101af515e0c334865cc12ecc2edbcca1110

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