Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad53d8b3089a091b…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 16:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa6ad8e4b42a6c48470db29500b4aeba SHA-1: eece3f680382625175d2224840aefee47a808ef1 SHA-256: ad53d8b3089a091bd098cd8a19fbf8d0617f8570163c94c1426f45d706aaeb42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. These links are likely intended to lure users into phishing sites or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://shsclassof1970.org/clients/872719/File/8071720124.pdf In PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210817172430.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fece8d8ca4d899114a9a49865c2111ea/67817706097.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a314a460241---77490586124.pdfIn PDF document text
    • https://loctra.net/userfiles/file/kanav.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118cd7964235---rejalaligetesijonu.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/jodiwuje.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/xuwevegaje.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/sikewuruk.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/54897629648.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/ninufoduzi.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/donamilinaloviri.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/55632022003.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///zavuj.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/wiwuto.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/wuvonex.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/15737733924.pdfIn PDF document text
    • http://trevorhannant.com/koxiwotuzewegufafaxet.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/8q27o22cl2pod2c9042pd197a2/torotebesaf.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/2082725074.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b6d21e8058fa6c8221a787af3be86fd1/6467784997.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/45297982166.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/24230340521.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bed49225a---didevesaxijofoberi.pdfIn PDF document text
    • http://k1a.ru/images/files/file/83932427198.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/zebedasizipirajaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cpe+reading+and+use+of+english+grivas+teacher%27s+book+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_off0000bf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF81 11360 bytes
SHA-256: 45c555043077209cb78191c5312cce1cd8d9f54ff1ca9b3b12295860f547aa31
font_01_sfnt_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 17024 bytes
SHA-256: 08ee203bc2b735c85241fb06aebb4b6841c25d88660d6690faa31cb595a5d867