Malicious PDF — malware analysis report

Static analysis result for SHA-256 c367b462f338059a…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 14:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: dd26bf847c033c3c54f193c2543066df SHA-1: 259d4497b04648304e1a265a4e9f05c5c3409a31 SHA-256: c367b462f338059ab55fd6f780efa53d5a9782d0b007b4d941d42c74701b2fd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and 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 structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://smidgel.ru/uplcv?utm_term=king+of+crabs+mod+apk PDF link annotation
    • http://everintelconsulting.com/upload/file/202109090327256547.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/99228400116.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/24374327435.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/56739964057.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/xatalupadizugo.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/tajijakotodewetijagupike.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/7186116842.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/xokesonufosexewukebokekuw.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b608e8cc3e---62972806393.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/10784484359.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/o9f94e4o3aca89397h40mseut0/xutivumuzitaboteguw.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zukonukor.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/dakokekeliboletadefud.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/53764646539.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/jinumiterumapipavija.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f54ae5dce---janat.pdfIn PDF document text
    • http://anindecor.pl/files/file/lazeniganoxozapuwalojugon.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/63770770867.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/xupavafibafi.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/80592374916.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/gofezitekakubumifosek.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_off0000adf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60E 10908 bytes
SHA-256: 01c113d5ff3fa5be1e887bc36f7868ef3c582b73ce7aab8a3c61d6d6973b2b7c
font_02_sfnt_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 14648 bytes
SHA-256: c55f3787d5b082b184e6640654e860e1ea2da429fa506077c84773f9dd57ecff