Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c5547e6e1ae3cd…

MALICIOUS

PDF

73.1 KB Created: 2021-09-16 19:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 209258b31c350540f580d206a47f10af SHA-1: 59accc01a34eecb6fc9b02e8ed3d9787dafa1df8 SHA-256: c3c5547e6e1ae3cd43b270f45bca24cd0afee6edb8037ffb65719f59e6f160b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=peter+rabbit+movie+tamil+dubbed PDF link annotation
    • http://mynigaoe.com/upload/file/20210910165320.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/dupujuru.pdfIn PDF document text
    • http://ombs.ru/uploads/files/pejijubovazuzavisaga.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613192fd7b4ea---bidusonaraxax.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/38756916262.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210916040755_1058804308.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7df1a21b6---2317103221.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/podozevegilolajagula.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/zediwuridememavipal.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/koxibosivekopoked.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130317e490f7---26214259362.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/86184561793.pdfIn PDF document text
    • http://thaide.org/userfiles/file/vorupubedevopiperom.pdfIn PDF document text
    • https://kham.vn/userfiles/file/benusufefapaliw.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/lidinoxisaxidubixuge.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210906163308.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/mabesukum.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/43507951865.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/50062166531.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/xokonusu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed5e1acc91---jigomegupilodetewedabono.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/78940906180.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/jamesawepapelara.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_off0000b965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB965 10444 bytes
SHA-256: 27431baa111ff83a902bce761a042c196eff6f7043bd220c60daa1c896b6d8c9
font_01_sfnt_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 17548 bytes
SHA-256: d0fe3c05199d31c2efb9ed1c24e52453ad7a6ca21fa50ec06a627610b0c48595
font_02_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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