Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f4327b6aebf5fc…

MALICIOUS

PDF

112.5 KB Created: 2021-06-23 12:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cb1aa08bde7d26af72a6e0458b578bb6 SHA-1: c104b7c6acf5912ae8110b5bf2c70cc10fa621bb SHA-256: 24f4327b6aebf5fc29f7b4252a63311fba8ada4099b79465e9c45a47bb8ba721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lederstuhlshop.de/ckfinder/userfiles/files/waperasowobejexo.pdf In PDF document text
    • https://fanaf.comarticle_ressources/file/30809137988.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gexarekedafumafoxul.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/17334443893.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/49266009850.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ee0b18de---79461433305.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/5d70efaecf228ee041c352babf4e4e85/tipudomejibize.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/lufogevibagerexuvexud.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2ddc6b3bb456da934162bd1fb7a388ae/96351919659.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094617a5f227---87598042087.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f0b0215ea534ca09ac826f73bfe1d74f/49206833140.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160747988f0fb3---239627118.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a236086c2---juguzazolo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662f35235b---42446414006.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c3ccab850bb1fa966493861a514c4262/57595992061.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e69b6b91d---97877126923.pdfIn PDF document text
    • https://artbynela.com/uploads/file/lujoxujojarogibazad.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/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=art+de+la+guerre+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 33404 bytes
SHA-256: 97e87340952e963a2dfbc9038d0a05834497764ae64ce86875d6469f7143e963
font_01_sfnt_off000178a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178A9 5020 bytes
SHA-256: f8cd1a4586eb1617dff484daf489b7c4dc3b3d6d997beaa65a3a202289dbf6d7
font_02_sfnt_off000189d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189D0 15196 bytes
SHA-256: ebb19f9c0839563b8a9d74e96025651868c7ae536b7fa3cea38457f534d19105