Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a0dc1f01310398…

MALICIOUS

PDF

90.7 KB Created: 2021-08-21 12:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7f08cc76b887490287adbe883e1eae3 SHA-1: 538f71f50775fa4141a685d1d98cefa0d5013157 SHA-256: d3a0dc1f0131039810f8449861979152042d60decd4feb2dcb7fd779e3e56236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://aurora-c.jp/files/files/26658517957.pdf In PDF document text
    • https://armagedonspedycja.pl/files/file/sunomekapupud.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18959ba79---degemurusisugakugateribas.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/10976869076.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/kewubesefidopogef.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/49647498582.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/64547804668.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/bomikixivemo.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/21058967547.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/64819146090.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/63thghs5cikb9n5f02c7mhn9kt/jasemubebog.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/sojoxixelifinurotud.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/37666084638.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/96650702618.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/49993082319.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/85fcf2070d3f58166ccd5f5f6d0ef64a/koduxudazowagijoxitivesa.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/11571064853.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/686dc5ee748cf04f58f96b7d34250180/66224979957.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/46694286482.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d04b6aa054---11847009040.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/37180867413.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/bagokadap.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/5389376468.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d3d9ac9ad---65330928384.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/vorixiximegame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=nepal+tourism+statistics+2020+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_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 10996 bytes
SHA-256: dc4a5c6fd70fe587d00d88483b61b0483c8f9911d8b97e1375b553cd35fd2d7c
font_02_sfnt_off00012cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFA 17284 bytes
SHA-256: 8ba97e9c0b1af98a9f4ea7b8c87f1161799ed999e3e6e6161946976675cb22e5

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