Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a28f6542b6d471…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 20:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc72a7d5e9a8f19fd3ee23d4b55aff0e SHA-1: 564e9abc9baad57b4fe35a52b03b83427f3ec155 SHA-256: 49a28f6542b6d471b32817bd36c12a3fb0b3e9e6a41130326275e0e3d8d3c62f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=pokemon+x+and+y+game+free+download+for+android+full+version PDF link annotation
    • http://watch62.ru/files/files/zekuze.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/gafinupa.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/pexezune.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/dc35bf164fa7c9c207ddd9e2a88e215a/252511858.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/fatugidakanigib.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/tujexadopufarijufejuvepu.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/74804104372.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/48888697313.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/27241019981.pdfIn PDF document text
    • https://doitoutdoorz.com/file/TbhvEW95Xe0kmjUE.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/bezixofijexovawe.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/741f0004fed161cb84d14d57b1b57175/457803488.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/14877241996.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f580443167---3591866571.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/zafepanil.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/93876218322.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/posilinuzoboxamo.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109141518199100.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/97321228856.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/fapagavibufolisamefebi.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/tugexamote.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/udj17dspvp0nl25a5j9avgrl15/xuvesinunuzesexuvafazat.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/mufafumigaz.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/zabediluxibexi.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/vutejezipibafarobetad.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 18460 bytes
SHA-256: 0cc5f05c625f6857d1d2d55d0f9f749ca7a8308a7a0aaa90b7bda70ebd8234a6
font_01_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 11160 bytes
SHA-256: ae5ed57a65c5ed09a7ebdc2f2a7f7980d06c62faf1530e7859ae5515b8633bc8
font_02_sfnt_off000122a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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