Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d01ddb0ab26a73…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 12:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4d545bdd6afb17ca76aad736e129859 SHA-1: 61a895ae8a2bf9f84879c9c80e0933294ca6bb6a SHA-256: e3d01ddb0ab26a7382acb389b6fb7516ea1fc19bb27e34050a5aa124dbb01082
196 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of links to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to obscure the true malicious destination. The document also contains an explicit instruction to disable security software, which is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://almar-bus.pl/userfiles/file/rapopomofedelivafufop.pdf In PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/tololorevufafizam.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/duguwibaziror.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/nilunapagu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/bad0435d87ddd611511f51ae2f307e5d/keguvunodototezojeniva.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/1261353518.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xamiterapuguz.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/tufunexirabagogoveza.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/74113834323.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138e8f8a5e34---15769611256.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/72782075559.pdfIn PDF document text
    • https://stopserv.ru/files/file/51683769895.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/39100346645.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/74343984377.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/zumasilamubudasojuj.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/5051873592.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648a6e8637---rojujogijavara.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/72417343582.pdfIn PDF document text
    • http://kotolantopeni.cz/file/mamibuwonisokoreruv.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/gadapuravoru.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/99826787663.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/furelapadebunatikog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=autocad+architecture+2017+crackPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/mirelutujikexidoxan.pdfIn PDF document text
    • 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_off0000b45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC76 10668 bytes
SHA-256: 8d35fe5f75e61215d9e1f40e66df7a8d6ddd119c4656eef32cec07728938b49e
font_02_sfnt_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 17368 bytes
SHA-256: e03737b18c183121113a77fe2fdcee144813bfd35c1d31649fc2fed6901e2f79

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