Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b57f302ec8e9b8d…

MALICIOUS

PDF

105.0 KB Created: 2021-08-20 14:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9cdd5bc7ac4e31ab6267f1059e62c103 SHA-1: 852538cfb960a75ac2a975ac03df4e41509f308e SHA-256: 5b57f302ec8e9b8d54d1b8aca4fda29a45d9af56021dd100ad383af18d7cba40
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 URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the extracted links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://breedlife.com/upload/files/xizajoboxodenov.pdf In PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/fe586abc08c7e28ad4940c351d1710dd/77817490478.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/25697513913.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3bded631da513e5a8727b55b272e2b7b/88790698473.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/pifokulowaxeraxipi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608893cb6c473---zegubad.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7112c24b9---10027684001.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607719f6cebac---todoxanexilalob.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/17743142042.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/1356141380.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/jadifafanakisev.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ba2cc6d13a0c959fb3e2b1342bf14c51/laserodarawifuw.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b524f6fde78c6710ec55286a2ec0440e/dizujewamizivujapoladara.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vghlshvs542bv1eals3kfu0fm4/rejisakewerebenimatazowow.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/wupurabono.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/32175048880.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/wuvudajowojer.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093acee3babb---50007345802.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac54d564172---81422909926.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609064e3e0425---damazez.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/weginuxonakurebaf.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/zoxiramuwul.pdfIn PDF document text
    • https://filetorme.com/upload/files/88529303951.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/80690974192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=escape+the+phone+booth+walkthroughPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010c6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C6D 24348 bytes
SHA-256: 6ca510cab87120d72e62c6aa79cc9fde1d0660f6a8fe6e4e78093ffb51b92183
font_00_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 2360 bytes
SHA-256: ef686b7a58f075b8b7c141f9ab2dd74427bf65b30853b64de9aa020c00a88abe
font_02_sfnt_off0001362e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E40 17536 bytes
SHA-256: ee57f078d3eb85dafbcbe30779a6d2afbd1acb1bfc6a47e8f7594b0fe9ed049d
font_04_sfnt_off00017c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C3E 10960 bytes
SHA-256: ec2a0b36bade9c06be628e48d0de3613aae201ee8a6d28103ef90ec35e0edd0f

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