Malicious PDF — malware analysis report

Static analysis result for SHA-256 17289ffed22e03d2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 20:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 50083377aca483c7adbe2b10645cd156 SHA-1: cd3ca9535c2e7838d5bf4a72190984989e14f114 SHA-256: 17289ffed22e03d2a92f5024fcafe95f854e413ae01e77bf264246ee00b850d1
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://thuaphatlaihanoi.net/uploads/files/wumonewexegaxuluti.pdf In PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/74314577537.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/xenogadotidupamakew.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631145201.pdfIn PDF document text
    • https://bloomeng.com/uploads/nuxazaxewotujuru.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/38169839973.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/90683031029.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/45082851045.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/57556118381.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/guxubanipugusipadis.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/suditozuvikobasegesumo.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/momusob.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/10075347741.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/zanuwixudadodevowupeviwer.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/53905174096.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/18502805437.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/gidavamevalozatejor.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/15fc0dcffba3b93891f07ba2b4dfadba/fitibogakujofavimusuto.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a86b713ff07870ca86757d8a42e2cb61/46726480365.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/86941548189.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/nisofonujibaponalevon.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/7575569417.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/55994792973.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/14946507570.pdfIn PDF document text
    • http://mariancozma.com/_user/file/jolumusopis.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/61772908861.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161387c2be5d90---36834106633.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/18506311754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+call+waiting+settingsPDF 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_off0000d14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14B 19236 bytes
SHA-256: b8de39ec5b7fd6e87309b5cf42d4f351b0e20641d87500115dc7eff3105163e1
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 10612 bytes
SHA-256: d3316f2243b2f450fb24c60b0e2d4f3e933cbe1216431a7668f99be47a30e60d
font_02_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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