Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6731dbf1c0d7d1d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 20:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54acf6da78a8e65fa1955742cd8b07ad SHA-1: ac01da83d3c59ad8e1bc95b83a3ea5dc5d5e88a8 SHA-256: e6731dbf1c0d7d1d53fe208b46fb00da9804b2deef619c1a0346ecbb46978af7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute further malware or conduct phishing. The embedded JavaScript suggests an attempt to execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://to-kajihan.net/js/upload/files/sixevuxapunufumewiseseba.pdf In PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/dubabuguze.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/lerutunirovoretikozexipaw.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6291a395---17751718159.pdfIn PDF document text
    • http://anm-av.de/uploads/files/xozadulinarowu.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210921042845.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/defifuzanunibome.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210901202247751064k24lno78wl9f.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/35696400461.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tenosebib.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/4060ccc1445a0b682e9c8b2c76f104a3/nufisodisepozepifowujox.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/42060642821.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tigaxegegutani.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/75924851420.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/zederixarutejojowujos.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/51923196020.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/gimolikozepadetevenebi.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/vuwojulixadav.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/jadazazizofoxegofunupuz.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/16744123658.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/funowatewipefolujurup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f86fcfeba---46592395384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=video+wallpaper+android+apkPDF 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_off0000d8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F8 10268 bytes
SHA-256: 01df5193614cfeb2d85b2e63b03b8af8b5c784ac8bade02c28badf3e01ea4ee5
font_01_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 17488 bytes
SHA-256: dd9dbba5af576f23fce8fbf8303f445c527ea8b46d7759dfece9338976c51366
font_02_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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