Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd1ea55457142b4…

MALICIOUS

PDF

74.2 KB Created: 2021-09-08 00:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d84affcadb369881eb00102840f5efdc SHA-1: ac177a295103c0664defb3dae2ace57424e1e2a1 SHA-256: 5cd1ea55457142b461b6c6e37c4e94df33ccfd7fc5d498dc5ad049f866a816a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URLs suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/86shrrj8p7g0lrlnd2caoru8o4/munisozowinixozatisupuji.pdf In PDF document text
    • http://velocimapper.com//webfiles/file/89239217305.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/devowuxadafemaj.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e33db1c52c8---70181988424.pdfIn PDF document text
    • https://signika.pl/Upload/file/25438352192.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20425ea11---filexijuvob.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/xofabedekubi.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/41058060514.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b918e096fa9---pubikuzip.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/39838925855.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/zesuxedokatojubovajopemes.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c90f4ee178---21253732939.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7899b238a---1397895145.pdfIn PDF document text
    • http://stevis.cz/files/file/91529342701.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/jukaremobasin.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/88392153208.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082488b06ed1---rutobipomulufemajisenera.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125a1e6e9e3d---72596114663.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/69719584945.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/danotuxaxamaxatixi.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/3ea0515225efb1fd103c815c560bdbbc/wedosafigidosifowiwezovi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b96673ab743b5009f791905fe53658dc/82411211077.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/2239d09aa80405837dc2dddd41aee0cf/xelogovinuwuv.pdfIn PDF document text
    • http://headrepublic.pl/images/files/fotomidaboxajexegagudeki.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/24040731399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=alabama+course+of+study+social+studies+pdfPDF 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_off0000c027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 11012 bytes
SHA-256: 075112289e0751364b281008476af9364c2860ca217b7cb5846c8b392b99fb0e
font_02_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 16368 bytes
SHA-256: 8111b7f3d6ba6be993b3039fc1b73ec80d9dc845b6a6cb35901878216e5c1802