Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef53aee21852d21…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 13:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95d0d7306fdc34fb71f0c9f64dee79cb SHA-1: e8f262d46fadfe0d59ec1016b2f9677b07064d8c SHA-256: 6ef53aee21852d21fd8ce486a88bba22f784843f419336c137b2a3a8955e9dba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites. Several heuristics indicate these links are part of a link farm, with some hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://rentcar888.com/uploads/files/202109031657473743.pdf In PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/64170080489.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/naginexugexixumow.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/10301710210.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143159693a28---90603476690.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/notevuja.pdfIn PDF document text
    • https://italvaping.com/file/jopiwaximudeb.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/selarewagov.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140eaad64d95---netufilinarabugojixeguka.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/bosopekifi.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/71292481893.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/jenamojugopuzupitov.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/sqfk8ar0j77ie34qp8dtntd63f/14834054557.pdfIn PDF document text
    • http://askaudit.ru/price/xajimuwivirolazupazabidiv.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090913590273499.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/73615792459.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/tedaseloleva.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210918_B8B429B7E9AB811A.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/gavimumeparazikabukabo.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/28629500619.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/lanurefitoromejizi.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/13882052748.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/sevorofezupaziwujipiwum.pdfIn PDF document text
    • http://semanbio.com/upload/files/99200284327.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/dojubotekedemikime.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6779901577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=set+layout_weight+programmatically+androidPDF 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_off0000b7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C6 17156 bytes
SHA-256: 1e5b9595e1480e487d09524994e163a6fa71c402669e7845a16ec2bd4494be60
font_01_sfnt_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 11200 bytes
SHA-256: 2caa08ee5863b60d842d669864b516fd2f74c25dad4883db752744563b2e8f9f
font_02_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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