Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d03d6599791d2c5…

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 22:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20a93f1103f44f7d03eb6c3e20964809 SHA-1: f9b354f241243ee888bf5170fe9c0156d980e55b SHA-256: 4d03d6599791d2c53b56d881f732197b843922d74f0e9a692184f3b9e30fe2a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://manhalhealing.com/userfiles/file/tonobupimavelezisudolu.pdf
    • https://nutrishop.in/ci/userfiles/files/xavudetoridizuwunorapemed.pdf
    • http://efeteknikyapi.com/userfiles/files/39139626772.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131310fa5034---24151584522.pdf
    • http://antropolog.ru/userfiles/file/21642777721.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/19292492221.pdf
    • http://vanhacollection.com/images/files/futozizixediwu.pdf
    • https://aczv.fr/userfiles/file/lisawekiwedinunowosolewo.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e49b93aa9---detupufadasujene.pdf
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/28952839091.pdf
    • http://parfumland.sk/upl/34674795035.pdf
    • http://runwellconsulting.eu/file/file/rafagipenowafa.pdf
    • https://suacuachuyennghiep.com/uploads/files/kotebonuwof.pdf
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/bexiruwarizizunuxumerugiz.pdf
    • http://villalapinetafavignana.it/userfiles/files/50476046713.pdf
    • https://songhongresort.com/img/files/pumolu.pdf
    • http://fireprovietnam.net/luutru/files/kanepuvatilaviluvukur.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f51acd3815---50946220261.pdf
    • http://brlairport.com/images/file/kesawakezabobavupuka.pdf
    • http://e-park.es/img/uploads/files/zigomezodawagutemejojaj.pdf
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/dufeder.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6abb9893---98744842425.pdf
    • https://swift-tw.com/lcc/upload/files/39808735282.pdf
    • https://bakotech.at/uploads/ckeditor/files/sagunekibiwulokosabesavo.pdf
    • http://simoncaulkin.com/images/88689041046.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pandora+android+auto
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b9.bin
bdb220437c969e6315b6fc3a0a79c2ed7f725d9f2f2b39b94a897e5edca63ad7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 9996 bytes
font_01_sfnt_off0000feec.bin
e7c420b294609d7588c5b73ca9539a385fd0f8992b9a9a43d1c8cedd8ca52021
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 18908 bytes
font_02_sfnt_off000130d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D2 16792 bytes