Malicious PDF — malware analysis report

Static analysis result for SHA-256 b978a594da2970ad…

MALICIOUS

PDF

99.3 KB Created: 2021-09-23 19:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 066304d528c881f7028838dbf8a65b26 SHA-1: 8cc44bd8537d0445754899a0cc02419d5fc4482c SHA-256: b978a594da2970adfbc65b6937dee24c016bd79126e24b5b4f59499769d50d95
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS heuristic and the CLAMAV_DETECTION rule strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://adbuilder.at/ckfinder/userfiles/files/rejidejemejodora.pdf In PDF document text
    • http://xedaphcm.com/luutru/files/33674885173.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/66526425420.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/24016695953.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d9e427beb0e1d21a9f276d21ed4079a8/zopinizaf.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/61006529949.pdfIn PDF document text
    • http://apothepharma.com/upload/files/risokofexulegapexotuk.pdfIn PDF document text
    • https://digicpictures.com/downloads/zuxovotamonapudomut.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210918122259_z4x89v.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/nimavufa.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/7924078261.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/sb5oaas1saol34kfms3b1ibpdj/jupojusilasozepafupurir.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e09ecc00fb---peruk.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a97fd7637---65040034862.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/neluvulef.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/28852884892.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/gukigalikitivawivi.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/vetajajutume.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/83038249364.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66b6d6f49---49780069409.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021911056182761.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd4a2307d2---subovimabuk.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/jobelofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=harry+potter+and+the+deathly+hallows+full+movie+123moviesPDF 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_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 20256 bytes
SHA-256: d797d0df1da8394a8825b7e58e467ef25c738fc31cc784b88788355f6bb9247e
font_01_sfnt_off00014b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B4 11464 bytes
SHA-256: b7b14cdfeb92a52382691ec8cce53c162675118815dc79f3751e3ba5e1b9e246

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