Malicious PDF — malware analysis report

Static analysis result for SHA-256 081bac82e503adcd…

MALICIOUS

PDF

72.0 KB Created: 2021-06-25 05:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6aaa90554f2944ba3422680a12f0341b SHA-1: 1d118041b3450ef573e11e80e6405883c4114902 SHA-256: 081bac82e503adcdac2c10f76ec1e8be881c5f334b6db050a3636fb9b205867c
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains a malicious payload. The document contains numerous links to compromised websites and a heuristic firing for a 'download button' lure, suggesting it's designed to trick users into downloading further malicious content. The presence of multiple links to compromised CMS upload storage further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c147cc2ba---33703510153.pdf In PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/fanirerofonifusiromera.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb4dd182df---fajugogomujowo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8a827eda---4929142486.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8bdb4232c6732e6e7b677b76b48b9965/2556083512.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3qi13tv0akacc3qt5uv66vdvfu/93431002270.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/dawovujipuku.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9d3ca8cfe---67482242580.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b78b54e0fb0---96078137294.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/nofapowedujodepuxoloxuxum.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/00ba4fd9914f6c00d59dc879d8ce451e/ledanit.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/78946168959.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2a89b35226bcf2c35161e04ef0de7bf8/dabuwusofebemu.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/dokobotatibu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/guluropo.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/52367236982.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee45f36572---vadazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=csir+net+mathematics+2019+december+question+paperPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 5932 bytes
SHA-256: 713b242224fc68c8f0593ccd1be70571069c6997a3b2e804a7acb3be62413fb1
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 10800 bytes
SHA-256: 82f68a08a376a12ffea41f76799137e007d0a9ae56118cbeaf56208d2c0e4c1c