Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0da625d2ee6bb8…

MALICIOUS

PDF

153.4 KB Created: 2021-08-28 14:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0c749e67524a102eba3db723f19eb6e SHA-1: 6d5e191ed73e0af32115ee4af21cded997629fa6 SHA-256: ec0da625d2ee6bb8fe823a4dcb96222782740fab2714bcb13d1a76259785e4e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially distribute malware or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/904b868f49d45b32a6be9dd594d89268/87832245686.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b237f2f0---31017394395.pdfIn PDF document text
    • https://incense888.com/uploads/files/202108221038017046.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f075e396d656d71ecfa13ebea2fbf520/37810538408.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/24181276145.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/60872566900.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/vabufipajibafarebomizigap.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3711ab9c77---63860222910.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/genijipujagok.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/vefukofibobasusid.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/su2f2pftmg9tma83t60ad9gqjj/fijivubilaze.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/dinavazawaziveraxeridu.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/59372428341.pdfIn PDF document text
    • http://bienbao.org/uploads/files/sevitibelapu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38c552dca---98503231648.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/dejufarijute.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/jejug.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/32856024308.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/4566989053.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f675a9946---3031964687.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161106d7868e44---53634328381.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/40339670110.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vsccc9riejhcv92u48vg7tso80/ziravolaberutebev.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/8662588363.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0f4fef08c3df9041376b97d6b29527e3/xabagepivofebujipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=oxford+modern+english+book+6+answersPDF 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_off0001ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC78 21364 bytes
SHA-256: db4b3cd826e83a59aca9ce119748d410645ee478d95c7fddfb4f0e095d199393
font_01_sfnt_off00022496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CAD 11316 bytes
SHA-256: fe696d647e9fdbc944573e73466e353c3e5d27d02a11c85851829b66c9691acb