Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb85bfe73b8ea15…

MALICIOUS

PDF

91.0 KB Created: 2021-08-02 12:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3183aa0ab99475842ee5ac5a9eb0f59c SHA-1: 8559bd8ab4ced42f1774a6257de1e61b8314476a SHA-256: 5eb85bfe73b8ea15f9bdc5388363e278690c343256e94fbde1104bb40b282104
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis suggest a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/bf14bf8f84ee50108d7cb60db2f0622f/wiwufenijavotu.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa50277eb---93268037171.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/70a8d92449511d6468bc282948bbb8d6/91639508995.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/927bee1eec085fac58a173e3a34c6e92/venimukamovepejov.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/tududu.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/4m8dq698861s10fg4klmjf1d95/joxuzukekivaduxofa.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/wovifamerote.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609661743168d---buvebal.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/nagim.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qnjn3jhrsmahlbsr4d6vq9p737/goraxuv.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/56878564310.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/d4qo42ngd41nqggal3uclrj0s2/padumebimevir.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/i18b0n9ahjelps7kqsk1sdb2jk/64510265832.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jb8mi10iba34mmmcunjk5qcrcd/95580810457.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/11249000895.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/valuzejo.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/gesewomifosusenu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5b2f68fea---vovutajurefina.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7e71465b09c9c205a04df03d3bbf2053/xonozoneli.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/i8gtl3drtlg2b71lcnh247mjcj/deneroxoxexagezavo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7bae0131b---gukidul.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/zirirukotikomop.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/25f675011dd7c660ec6cc0da77a4801b/42075443882.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/162def7247e20b017a5e5fb7518cb2ef/deririlugo.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/80785008266.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c159392a9aa---29189318892.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/gojafukelizabawigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=european+shoe+size+conversion+to+indianPDF 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_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 20408 bytes
SHA-256: 9db660dcbbd3e3e5d012cab8e751799c9f2070079bf51a1ad310f829c2429aac
font_01_sfnt_off00012c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001448d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448D 10776 bytes
SHA-256: 1424150e8c22088014e290a1e82ccbfe09bcab562713468229104d84b2b04061