Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ece4eb9305aa242…

MALICIOUS

PDF

78.6 KB Created: 2021-09-14 02:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0fb518f5b5b1477db857c6527d9fe689 SHA-1: 7b49ac0d9df0c2eb03167dedbb2ba974043d167f SHA-256: 1ece4eb9305aa24285ba0eba64fc74e153b42d4c5b0567e0a5c050664f84cda3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised websites, suggesting it's used to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://zibarajabi.com/cache/fck_files/file/bidofofi.pdf In PDF document text
    • http://artpolyclinic.com/file/files/ruwisezos.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/47628041417.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/95550934317.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/de6e69993fda14e47cf00ee4045d65cf/17410942595.pdfIn PDF document text
    • http://wajl.net/img/file/202198194237.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/nuwanewunuwixadusipipe.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/jaliki.pdfIn PDF document text
    • http://jinyezi.cn/upload/16789084822.pdfIn PDF document text
    • http://klemanpince.hu/files/file/xovabukumedawe.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf7269dc8---51424463504.pdfIn PDF document text
    • https://bunianco.com/other_files/File/gesetovoniziwopi.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/xaraboberutexivopirixaw.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/vogilotikovuwoka.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/34076309096.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a872507ff---80411461417.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/pisafabetedukitil.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/wukarigigaje.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/27674795204.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/wibisifemugotavalixavo.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202194160396792.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0506a0162---27423629402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+legend+of+zelda+link%27s+awakening+gameboy+romPDF 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_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 17468 bytes
SHA-256: 3efeb34db8a04d0e250b4c36b612da2bde9d484228e8f0821a14688dedb60b26
font_02_sfnt_off0001123e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 11192 bytes
SHA-256: 4df58e4a8d72118ac22d4104bf2e374a0984c41a144daf9a837b2c0f91188f45