Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb84f2bacfb2f53…

MALICIOUS

PDF

71.0 KB Created: 2021-09-20 20:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5e1784e454383fe956e17344fed1334b SHA-1: 169b9bc90d2e32d2fcd1f98be511f149a02ac5df SHA-256: feb84f2bacfb2f53015b508195351789eb4a2df7cf30e5c02495c2c749085854
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious or phishing content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tandprotheses.com/ckfinder/userfiles/files/wovulopunilekedowop.pdf In PDF document text
    • https://sport-jicin.cz/dokumenty/senutijijuf.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/69434616093.pdfIn PDF document text
    • http://vietnaminsight.biz/ckfinder/userfiles/files/xawiwebuvunewimizupogum.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/f44ac4ed25725945e92c693a5bcd7d60/42474596373.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/jamogiwuzezaretiga.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/r33upb1pg46s8unvfs42iu2puk/topidow.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/60146815078.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/78309395038.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/redavamasatafizupuladina.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/90174989264.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/kikuvebutukagorabe.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/xugatajusubesutolijuru.pdfIn PDF document text
    • https://theurbanthinktank.com/files/defuwiki.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161395e50a0cb8---22123834064.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ott1bddd64ljk49o2d0hgmntq1/41483230305.pdfIn PDF document text
    • https://aneri12.eu/res/file/pobojizegukaxevutudeg.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/91879382382.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/46053905824.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/24726520020.pdfIn PDF document text
    • https://gulamanis.com/contents/files/vijogexen.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/dibadazavefusenosevamam.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d3bfa863e3ffc6f1e824ff66c301a619/goradevofadewuzitizup.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/2038027843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=redmi+note+9+4k+wallpaperPDF 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_off0000b345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB345 10856 bytes
SHA-256: 3e420050576989e9599437230c6f17150c6978a2b8ab259b949755a41d25b774
font_01_sfnt_off0000cc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC68 16876 bytes
SHA-256: e38d7a950c692bbc79a41bd215235d69f584faad94a36d46c51d87ef737fedb5
font_02_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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