Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5e0ae07fcc8313…

MALICIOUS

PDF

114.2 KB Created: 2021-09-20 20:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 274d09d08db8debc59834df289eec444 SHA-1: 52469b33714d1081fc4848497dde8a3cde2e2bd6 SHA-256: 4d5e0ae07fcc8313890e98c24a6cd571a449657523524e1f0205c62dacdb829c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://bayanairag.com/uploads/userfiles/files/39089252317.pdf In PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40707699913.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/62863334538.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/78782996662.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/xojefabotawolubute.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/kisebizagife.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/porufitadozugi.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/24364920956.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/dupuzudamalijefugonojoxuj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613105a54e83b---65780280339.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/mevini.pdfIn PDF document text
    • https://izometal.net/mm/file/78791280694.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/mewivenevuzajiko.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139080a6af82---wajemukimajena.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/77091991294.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/65740323192.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/20108556807.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/jedijozudojunakevas.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/7485146704.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c4886fb68---kidabuvuvefofizagala.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/6054362812.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/ladiwemevepal.pdfIn PDF document text
    • http://pjteam.hu/uploads/dobenutibekum.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630782226.pdfIn PDF document text
    • http://pb-book.com/user_file/file/59796940566.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/defimovufizawixopewad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dnd+5th+edition+handbook+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://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_off00015767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15767 10648 bytes
SHA-256: 562db52a8c99e456ebbd0e7316b6d0756005bf3c5160d78095e158c4da1be782
font_01_sfnt_off00016f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F84 19672 bytes
SHA-256: 53131dd3504eaf0b6b822f431d04bb9c55909d07490a773b87cdd835957927b6
font_02_sfnt_off0001a264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1