Malicious PDF — malware analysis report

Static analysis result for SHA-256 59fa633991dc3795…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 19:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b923a7caaa2d2af98cf8cc028e90f118 SHA-1: 2276efdd88bbae048b3fc7f4bb3e13529f8a7a5f SHA-256: 59fa633991dc379512b4d06d0c16b1ac8574f59992af05a64cd58873e50676c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gocoachfox.com/userfiles/file/49711633086.pdf In PDF document text
    • http://karcannakliyat.com/userfiles/file/wadekopekixujuzutiriwo.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/71183942282.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/fuzapamadawukuwawitabisap.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/mutelimofadesalipanu.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/19843579516.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/regewamudufubefi.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/34108420274.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/xibamosa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f8f4e546b97dcd3973abd2df29e4775d/95420007198.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/44571230446.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/34482828921.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/fadutubotaxux.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/jisebusuzimaxexegevu.pdfIn PDF document text
    • http://hidropro.hu/upload/zigaxabize.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/43109604262.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109030509408347.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/weterubajojurubolegixu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/888305fb581d4d7e3af44d4cfefb6dbd/fatulileb.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134dc1a73e2d---68225910834.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/jiwezokidal.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/93199338004.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/86492290312.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/deguxefubavopowenijovolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cheat+robbery+bob+2PDF 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_off0000cc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC77 10200 bytes
SHA-256: 806fd9f2b492943ae427d954da162e27182cd102dd4b822c78683f769d522251
font_01_sfnt_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 18744 bytes
SHA-256: 527c0079dcd953a30b8d1adaabeaee5e4caa56cd6d5205c33b2e21a88430c860
font_02_sfnt_off00011329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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