Malicious PDF — malware analysis report

Static analysis result for SHA-256 469ba52403753940…

MALICIOUS

PDF

81.7 KB Created: 2021-07-01 13:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cfed1e4b8987f728ba70f39cef314d2 SHA-1: a5f7c1aad5616dc87eb8e77393aa5bb8d305877e SHA-256: 469ba52403753940e4e5c3778665d5bf0788b9b7d1de4165b2fb773cfc6e5f5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The file contains numerous embedded URLs that form a link farm, pointing to various compromised WordPress sites and disposable hosting. These links likely serve to obscure the ultimate destination, which is probably a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160821b7428b33---sisazelubazimaxev.pdf
    • http://adainst.com/uploade/files/20210630042244.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607234c2511f7---wizur.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mevufq1m3hsl1r0ej48hb92si8/75085035698.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1cfa0bb35---63077888518.pdf
    • https://brianhigbielaw.com/UserFiles/file/deronad.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/47155583446.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f8938041a79e730771b9517644819e83/86509273756.pdf
    • http://4bx.pl/public/file/6985690968.pdf
    • http://barudan.hk/UploadFile/file/20210613205721146.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/513fa24fa7524562afe6bf77e1947ed2/jilujigimaz.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf2ae82986---loxomuxux.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/qrqujsepdvrgt64uvmffj5l8sm/jimosugopuvovogobatuti.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8o8hbu4r07o6gtbe88lkalg2l1/67714805037.pdf
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/relumif.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe9b1eb77---47262244105.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ja49vvo2hks9lk8sgs2c3n7hjh/kolana.pdf
    • http://sarlampa.ru/upload_picture/8957588283.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/th2b8osiraocbi4stj59slh1pd/12080691474.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mcigdov9e1675pj9mie86qeqj2/rokirile.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/o894kjr3em7d36ar1kdfra3496/suserologepozalato.pdf
    • https://agrilaui.com/userfiles/file/pizonikozudo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fire+gba+apk+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ce.bin
478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 1760 bytes
font_01_sfnt_off0000dd25.bin
12e9826543a2f526b5bac0daa5c87d60e04f48e5b79bc0c72c87d175305f3d0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 17020 bytes
font_02_sfnt_off00010977.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 16792 bytes
font_03_sfnt_off0001218e.bin
ed6fbc2b51b8429bf9cd3a5849411d2eb5245630f8ae34af1c76c35c4aa7af77
pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 10596 bytes