Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d25e81ddaacf15b…

MALICIOUS

PDF

87.0 KB Created: 2021-10-11 06:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: df560ab7bd8d397bfab938dbf2eafb6e SHA-1: edf52cb14cdb70d846fd2eadffb42728498ffcd7 SHA-256: 4d25e81ddaacf15b701554c8f53cf49b35737a6db128f02222cbbf1c226d3b42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to external sites hosted on potentially compromised WordPress installations or disposable domains, characteristic of a link farm used to distribute malicious content or phish for credentials. No scripts were extracted, but the structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://enjoy.sk/editor_uploads/system/files/94567765604.pdf In PDF document text
    • https://fanaf.org/article_ressources/file/26158650067.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/97950378457.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161608b5a0cbcb---50467276630.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cca8f65516---96997628955.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/supida.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/39818051369.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210902085000.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109070336026233.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/33841565742.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20211005144339.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/mejonanuw.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1a01hi389ge05323bqafmj176s/27797306019.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16151eb52ce39b---wawem.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/xunalokowi.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/96840126225.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/nekida.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/mobowakemugajexowep.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161590fd00f3ed---kufusuzuzuzoteraxilogato.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/42672348233.pdfIn PDF document text
    • http://redactron.com/userfiles/file/mopuxutuwumef.pdfIn PDF document text
    • http://3asoft.vn/img/files/1051470843.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/wazutarufawapugi.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1gvr2cn15ilj53l53q20rr6r23/66006519548.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16153b02dde827---33170081893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=as+i+walk+through+the+valley+of+the+shadow+of+death+quotePDF 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_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 11112 bytes
SHA-256: f35da42db996174279631f9b8fd7232beefac4455bf6c0a683cf10796cc780ba
font_01_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 19768 bytes
SHA-256: bcd79d0c552ffc0e6c8d782bdd14ce2ec7d59857f2eeb70d8c2e69fb1652d365