Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b98a03e553723c…

MALICIOUS

PDF

90.5 KB Created: 2021-07-03 16:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce022d1ef569bb3824811fefa8485b6d SHA-1: 5e30a83f9d37fc2283472542187280a23fedd807 SHA-256: 27b98a03e553723c97118ba4dc87de1695a8f151fa6285f7fb6d6c1458deed43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/90ddcd72b52d045fbef5823c9066b446/39086972007.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1758adf206---57871034836.pdf
    • http://glotecgh.com/upload/editor/file/28913255446.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/58d42b11d60dbde1752853a29957aec1/lazija.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b63aed06171---fopaxonamikexawiguxo.pdf
    • https://vipbeachhouse.com/uploads/editor/file/69387073558.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afe57d560a4---taroxovukotujatuni.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf207391f4---watulalosopilimawixogare.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077007a66d8d---vojijatebidopikadojiku.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d858a3061b9305c88ff2756493708ffe/bamumikamaziroguk.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775d3ac30fb---rowaporasidedir.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4053637725cd6939eb3c19ae9b33e40b/xojebekim.pdf
    • https://macauroommate.com/ckfinder/userfiles/files/dakazuwekutirarofekes.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb9cf3a26c---88481082351.pdf
    • http://vervesimuhub.com/userfiles/file/susufa.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/3f935902d6794d3ce6e6bca40638222f/32961272215.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3def426e9d---rofotogolizodaru.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0458c3f734c0384186ad83a559e60ae1/pukoxupudararevaf.pdf
    • https://moveo-sport.pl/userfiles/file/14335874930.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094eaa961543---45351090583.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/soxuzorunokizavonuputiv.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/kudakezabarenenerasepa.pdf
    • http://christschoolblr.in/userfiles/file/gejinula.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a600a6b7269---64156846458.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707e56ed1c---gagiroke.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fab7c00a03---naxibirara.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=different+kind+of+twins
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010001.bin
5c974766b2218e73e4ee017a591d18612f1f2a99523e8cd0b2499078591ee3a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 10320 bytes
font_01_sfnt_off00011777.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 16792 bytes
font_02_sfnt_off00012f89.bin
752864324796b5731eceb401fa0180b5ed0f0898b02ec1e019e2f4f1b713c096		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 17468 bytes

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