Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8278027ea15334a…

MALICIOUS

PDF

87.0 KB Created: 2021-09-10 11:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e36b04c20cbada3035442bd69dcb2e0a SHA-1: ea829d4f4b4dc308f469366c67b3aa7669a4b464 SHA-256: a8278027ea15334a67d6c8c1906f1ca4b883ca4e5dcab4a738d77bddff0e4de2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on domains flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious sites, potentially exploiting vulnerabilities or tricking them into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tpijobportal.com/ckeditor/ckfinder/userfiles/files/6937412836.pdf In PDF document text
    • http://royalrep.com/userfiles/files/susojoj.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/gugexikijope.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/60778595003.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1461103446.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/gupupomalim.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/79410571910.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/fikajapesaboveveviviv.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/vamelisefede.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/xokagukitasow.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/lawoduwodusuluji.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/56348240899.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/18681853170.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/36512494202.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/kakotanofekoz.pdfIn PDF document text
    • http://axwelindia.com/uploads/69275107819.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/dixefi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161380fc9d638a---83084154145.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/73fc67fdfe9fac8557251c8f59914605/90263663267.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/4eeeo82tkfsp2qjltv56js74b6/23132638480.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/64571814585.pdfIn PDF document text
    • https://designclarf.it/file/figogosobisiziwazexonew.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/22606035061.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210910_99950673018BE4B4.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+studio+delete+module+from+projectPDF 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_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 22356 bytes
SHA-256: 69775d211296e9df2202363193852cc463aa511b9c6ca4a7fd176585bc84ab44
font_02_sfnt_off00013310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13310 10832 bytes
SHA-256: cafdd64e38eeec877b40921282a78d80d54f542ad4a0f078359d265ca5deb8b0