Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19d03f998778ece…

MALICIOUS

PDF

90.8 KB Created: 2021-07-15 09:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: cd3e700e539012cc73b1d2f25db063d7 SHA-1: 54e3dd44e5b491a1363f02dcb4c54339621b1fc4 SHA-256: f19d03f998778ece8ac64f27adc927699fa25f6fc8a749ef4c7bfcd90b2022c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=working+3ds+emulator+for+android PDF link annotation
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2afb51509---fugaxalezusowurazadufaza.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210621035846-72885219072.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/25047062138.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/89063331028.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/ratilarefejiriw.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/89303118779.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4dejshqn44cipk21olnlnhbpc7/jetugilerawemeduzuge.pdfIn PDF document text
    • https://arerp.kr/data/file///vujubikabewiwor.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/17777855847.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/69297241627.pdfIn PDF document text
    • http://islandpointfl.com/userimages/dalofekutujirojuguvosuxum.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb55e9a139---87566479422.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/gozofupawawejag.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/ad4205aa64a99307f379efd2c5ab4511/14362659960.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/28993803656.pdfIn PDF document text
    • http://metallpress.info/files/bipelewuzirusuzaxojoter.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/facc77add6493d1031ac806fac9efaa0/55176378603.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/73sonsdila8tq8bb278b5jd3ap/37611774205.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ngpc2npe0f6v2nmld06lur1isr/4390885294.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c13401dd7da---sipixutuvim.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/71398472479.pdfIn PDF document text
    • http://msiutilities.biz/documents/61388960937.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_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 17620 bytes
SHA-256: 185da340c415e054e06999665b9bf8eefb339e9f1503e630ff26bb3f7377c60d
font_01_sfnt_off00012c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001449e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449E 11052 bytes
SHA-256: 9495cbc8ed4cd810c6ad91cc6e6a0bd3e63cb60e554d9784d70d809beba09928