Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1eaa3bd5ed76429…

MALICIOUS

PDF

88.6 KB Created: 2021-09-13 03:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe1889f0f52c96df8c24e0506c23d62f SHA-1: 66600c0f8d0becf72d1ae45305ef91d55a66cef4 SHA-256: d1eaa3bd5ed764294e90c4f26fb0d6ef729e195edae18e60361feff793ce5b84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or SEO spam distribution mechanism. No scripts were extracted, but the primary function appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/033406fa6bca9dbee28dec149c2d8a71/pojorakigigana.pdf In PDF document text
    • http://www.lnk-creation.fr/upload/file/13638783654.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/kikigidudikatibejifono.pdfIn PDF document text
    • https://onlinendttraining.com/files/68596757815.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/bunukarim.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8fde7cdd---89621003403.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/88417378299.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/pelexamigiborinofowik.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab9bb7488---newojanewofexozavinab.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/wepis.pdfIn PDF document text
    • http://gtshotel.it/images/file/78160096296.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/50971165820.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/85743623021.pdfIn PDF document text
    • http://medi-sen.com/files/files/86324894983.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/gadepevoxur.pdfIn PDF document text
    • https://thehouseproduction.net/file/58763853104.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/saxetejosejedetabi.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/69675994491.pdfIn PDF document text
    • http://erictex.com/ufiles/files/tegisaladadofopukutes.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/94741184510.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/xuvetedimev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=keyword+difficulty+checker+tool+freePDF 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_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 10520 bytes
SHA-256: 7d031d922f4a097a13a99c8114f780969f5cfcdfdeb25b3b89d4ef0c45e15c2a
font_02_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 17812 bytes
SHA-256: 43f8b0a6c37288122ad86d6912e5b631d33d3cce75c43c5a5f2263e05f82fcae