Malicious PDF — malware analysis report

Static analysis result for SHA-256 c534e4b8ce6b6be0…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 01:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dd832f7d046eedb179b498976e1cd71 SHA-1: 6cfade1517d712de3d01b249c86b3c8af32adc0f SHA-256: c534e4b8ce6b6be0c5bb87280fe88469c4201393a292864218ae065655015165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095388d84dcf---40151021057.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2a757f3de---xubozewimosuwepimovos.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/88653381513.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0a58734a---pejavuna.pdf
    • https://nadinerogger.ch/userfiles/files/64713739686.pdf
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/mazazijedisuwirolinadab.pdf
    • https://airflow-skateboards.com/upload/file/9989336521.pdf
    • https://longhoang.vn/upload/files/64676117599.pdf
    • http://shipagents.nl/uploadfiles/file/sowamedap.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dfacdd08625---sazakopebesinibekasezepi.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4fa57a95---ninozuritaponibonap.pdf
    • http://fongyoskert.hu/userfiles/files/tavuv.pdf
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/60699147296.pdf
    • http://orchid-daikanyama.com/userfiles/file/lifujeloxuduvu.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/80761054086.pdf
    • http://potlista.com/file/files/30768615053.pdf
    • http://www.northern-japan.com/image/upload/File/36015338756.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/02l9gq3aehfg35mub6cm851qv4/taromufavewixolo.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f833c746a46---bamaxuporenifugobig.pdf
    • http://tuzy.pl/Upload/file/20258641568.pdf
    • http://eraldocomo.it/userfiles/files/xapunifotobulowudavile.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130c69cd567d---25378659468.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=revista+botic%C3%A1rio+ciclo+6+2019+pdf
    • 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_off0000bfe2.bin
31e5bc3c1b1a5b7ddb0ac06a37b1b61742f4f01abde89b0634090c8053a5d8fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE2 11568 bytes
font_01_sfnt_off0000dae1.bin
1f8b240df5dbab998e56a903f8f64dffa5150b1a625d0d0d4be0d1ffc9ff8866
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 18672 bytes
font_02_sfnt_off00010964.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10964 16792 bytes