Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efef9710be322a7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 08:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f426e94e049c4a92af1e526590301329 SHA-1: 191b2da0e2aea30b3cea5047cb9c7bf14e7b2cd3 SHA-256: 4efef9710be322a7562de8735ed65dc7c0d4d87db0b19887b9d43d6158bf98e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ispartaprefabrik.com/ckfinder/upload/files/bemovukatiwofodex.pdf In PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/adfa899fdfdf3152de5945b3d9805644/luwizaki.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/vemexonemupapodeg.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/kukiveni.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161097a598aa62---44868986657.pdfIn PDF document text
    • http://placc.info/up_image/zilovibufusu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c277598e2f---petisa.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612717c3bb45b---nuxewisemomonezuxilovefud.pdfIn PDF document text
    • https://songhong.info/userfiles/file/46467742328.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/av04g845ai9245260qnucu34mb/neganibifuzaxemidazovifa.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/94068605980.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/d2e8f45n0anh7tfmqtb7eiubcv/wiririgutaxogokit.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611a47f580a4b---59947842501.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210713_14816A3671DAA38A.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/jikiwumi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5569ec120---toxubexifalokemug.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0e73bccd---21288732145.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/2s7ao5np3nbtdq589s751nub37/tizufugir.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/velasibadizujofazif.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/28537992002.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160708c7d56142---lafofefazeratalu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a391709a---59941211363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=apk+last+day+rules+survivalPDF 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_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 10516 bytes
SHA-256: 0c83e8295beee78d3f7b31e008f674f1ef16651fe580b72d4fb140a626058d48
font_02_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 17368 bytes
SHA-256: 6597dc5182478301da9db79ed3e74ece7c114d5756ce0c736bc35759b6045621

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