Malicious PDF — malware analysis report

Static analysis result for SHA-256 14087fdbf4f65651…

MALICIOUS

PDF

107.3 KB Created: 2021-06-20 15:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0862ae37857ca8db0fd9c179aba44097 SHA-1: a8b7a3db9be09989e96aca2937716d238f0daa45 SHA-256: 14087fdbf4f656513a41ece4e67defe7882634c9431dddc6ebb289d71e69af54
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The embedded document body text is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://ttccid.com/userfiles/file/8716642003.pdf In PDF document text
    • http://rocb-ap.org/file_media/file_image/file/taguj.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/efdcf2b2addf42b57073c6b57ad8154c/78546244010.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ea654c01bef3c10676f15fcc015a081a/24952690873.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/9832365380.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb7cfa7319---nakunixidobe.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/66e22b78e5fd211dc7af17a9d1432575/61417740366.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/nodirob.pdfIn PDF document text
    • https://mylodge-naoshima.com/35081804841.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5cb161f962e500b7ae13578a69295815/17791389707.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c057d1d5fbbc728044ff948b901c481b/40814512556.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/xizofawujam.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/rakivezunavajiwifa.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/rubepalawofelaxo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160702959bfd1b---58511573180.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160832d140f69e---kopojigomilerujam.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/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=warframe+how+to+get+chroma+partsPDF 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_off000164b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164B7 5504 bytes
SHA-256: c8e05cb6e5cf59367d351ddb6fe4f1d7c281f9a862f87ac6ef085c6753344ac1
font_01_sfnt_off00017769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17769 11956 bytes
SHA-256: 59c0619d21fe2dae78dac79d79dc12c11fd19fdce6f58304e55f15018bd1efa4