Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e868296132a2f91…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 05:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0bd19c88192e8816def5e09fb77663d3 SHA-1: efe1345a46dc3f655f8737dc886c74324ae6cc0b SHA-256: 3e868296132a2f910cdfb9f15cfd6bfddb469a1563f82b71c5f8e8465a2e6bb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a malicious link farm, with numerous embedded URLs pointing to potentially compromised websites and disposable hosting. 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 embedded URLs suggest it is designed to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=paint+para+android PDF link annotation
    • https://pcetravel.com/files/file/gizer.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/mumoneturukokezexen.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6b218a781160c93a71f474823c2eadef/86429926309.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/31216122277.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e0ab883595aef06739c6a87314837159/navudilixezepesul.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/bepodidisexepuraleneg.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/78904599861.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/morubijafe.pdfIn PDF document text
    • http://splogservice.ru/content/files/65662097944.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/kitemiba.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/luzidevijugizubixe.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/dupovokabetetukisaf.pdfIn PDF document text
    • http://vln.nl/files/file/67373801266.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613275bcb7eee---18861094526.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/mogezuboradajobad.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/pevidofejoremap.pdfIn PDF document text
    • http://fitviewer.biz/files/file/38732039935.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/38487041084.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/diwiboro.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b899ca653f---83871227872.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161395fce54194---58946883465.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/tajurubilowujise.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/79530305982.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/86324351451.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/dijezi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 19592 bytes
SHA-256: 74354b68e6ea2a5aeb44ab39962255059c22680440c0fb8d207dde55e3de1d73
font_01_sfnt_off00011a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7A 10040 bytes
SHA-256: 9b0bf2d2b010e7f4e79bbe1d0a9b2ee25e811a1a56102d66c202576285fe4c89
font_02_sfnt_off000130cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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