Malicious PDF — malware analysis report

Static analysis result for SHA-256 5653b51cdf7c40a4…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 15:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db29c56454f0e288787bb4f9dec63af5 SHA-1: c9221919bda579de306fc8be560cc58f3bf0ae0f SHA-256: 5653b51cdf7c40a4af25aaeaa3d647f7663fb617d355b5d781054ab05cd809fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/513466024e030acf8afddab3939d9538/xaditovotijozu.pdf In PDF document text
    • http://betonkeritesek.eu/Content/files/benelik.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/dafavud.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/39f533975d03de1f07b21beef83d7736/jusanozexiseg.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/mozofujezow.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/zexejujeri.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3691cfc3a4f7bb7d763556925f97c653/44486567938.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/11561364573.pdfIn PDF document text
    • https://hojoairport.com/images/file/57863889388.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/73128479162.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/50353114181.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83c683080---meboninevorebovezuj.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/6471794094.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/rupupejejavako.pdfIn PDF document text
    • https://atiksigorta.com/files/38256028255.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96f0f67791649961d7d2309d531f78bf/9277365703.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210916164515.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210904235800.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/wubafami.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/daxenit.pdfIn PDF document text
    • http://ranch.pl/files/file/30453679184.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/wakaper.pdfIn PDF document text
    • http://01host.ru/userfiles/files/xakiwipabelawabazedejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=king+of+fighter+97+download+for+androidPDF 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_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 17776 bytes
SHA-256: 64e7af474b4b263b9e511a1d9ce2789c7853d141955949b3f3941ca86245659d
font_02_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 10760 bytes
SHA-256: 2765635bfcc738427446c8c955a13dcbc5f8c81017b761a29faffb8802c2813b

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