Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb813cc28c8fcc50…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 00:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5204109d06b67525982b3242f1548efb SHA-1: 63a2f02ccae6f0b8a3d125845d1834e6bd7e40e2 SHA-256: eb813cc28c8fcc501897826553843d378097c6534d42de49920d1c224a70dd44
204 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains embedded JavaScript and multiple links pointing to compromised websites, some of which host PDF files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://turnwealthy.com/ckfinder/userfiles/files/lizubavunuterati.pdf In PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/33190186836.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/rupepiwisojafuvotemupike.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/rawobogitajobifexejiruz.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/5015168862.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/19910131401.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/54891137595.pdfIn PDF document text
    • https://digicpictures.com/downloads/tudezoruferuzigoxow.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/p169e78mdcegcsek6qnk99i6eg/gogubidagal.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614238f89ae4e---gepiweseluwad.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b11370439---96802404210.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/dejunexapetal.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/nofevegasilasa.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/42009737073.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/39668189277.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/36571434147.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/35167329237.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/daxojipadokimepe.pdfIn PDF document text
    • http://bulmarconsult.com/files/poziteferawimabe.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/32600549339.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/4381993514.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132808017b77---joriwediz.pdfIn PDF document text
    • http://domexpo.ru/up/file/vaxotef.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puperabodipeja.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9f3427932---fisemisozovinoraridawoke.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/13552245699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cazadores+de+sombras+ciudad+de+hueso+pdf+google+drivePDF 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_off0000c992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC992 11260 bytes
SHA-256: ccf2d379cc8d91f7ec6027fb5885d69cadebede47d3f20bca69236f90050b444
font_01_sfnt_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 19544 bytes
SHA-256: 460f263c9bd5f9e7773ef64ad469f0646603f16f9d8e0ae5f2efdabbc0ebf33f
font_02_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.