Malicious PDF — malware analysis report

Static analysis result for SHA-256 db713fc547715e2c…

MALICIOUS

PDF

72.0 KB Created: 2021-09-29 07:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ad66a2cb1174b52899941bffbece86f SHA-1: 3aab1bbdfb6bfd851766bea0c05c676922f0230b SHA-256: db713fc547715e2ce0ea1e3b391c2ed1b10bff1514f62b33665ff4034a5d403d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including one with a 'utm_term' parameter, suggests an attempt to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ketchas.ru/uplcv?utm_term=all+uncommon+fortnite+skins PDF link annotation
    • http://thunderstar.cn/userfiles/file/20210923004927917280002.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/34037951443.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/58523653935.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/33085101463.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/41393568567.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/63941220140.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/31ff551fc609257c319311f492a18659/jokilimimamizewoveburepe.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/nikowenojejogemizuvalege.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16150bb531c9a2---jageperoweludu.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/1801547015.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/wuferoge.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/15079016886138d74461ced.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/27718210207.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614604c43fcc8---polusiwejafepupavimeneg.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/91990008948.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/a0ii98fq6d7qp8u934ms2e7qm0/95415760942.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/68230058040.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134db8be2f4b---nanuzimifuribewekovamo.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/34082186352.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/genabux.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/82736442391.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/23597720460.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/56610456197.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/barumuzerexufiribagen.pdfIn PDF document text
    • https://lordoptika.hu/files/files/jezuvido.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/xuxagilerugusuxuj.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_off0000b781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB781 16616 bytes
SHA-256: 098380ccc6191e9c184b5172e1d60cd54f77802eeeb74479e8c47ad1ea9c9aa7
font_01_sfnt_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 10508 bytes
SHA-256: c317706d355cce9f60bca683e8cbe4071faba188e4c0d1dc5a5bb2f1bef2299f
font_02_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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