Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb027febf17b87af…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 20:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c520d61652721137c07b2d7a8a186fc SHA-1: f13087c5dd2fc0a8ca9193d4d784ecb90afadf5e SHA-256: bb027febf17b87affeee0e598aa5ca248d6efb19aa52b7d104b8a94458bbe0b9
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update. This is a common tactic to trick users into compromising their systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Several embedded URLs point to potentially compromised or disposable hosting, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://archism.ru/uplcv?utm_term=open+phone+browser PDF link annotation
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/36918783087.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bde4c808c---papazofikuworuk.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/93345245751.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/jikuzosuborilepanope.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb24534c5a---26390104404.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/tuditaxokupo.pdfIn PDF document text
    • http://tianfonmm.com/d/files/kusamuzebaburelot.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/zifena.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/89367337565.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5c5b83b1---sinowajufokiwidalujedum.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/totidodiniwosufagorakogaw.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/76831471693.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/46480806703.pdfIn PDF document text
    • http://partnercable.com/files/jomorenaxuwabopadejul.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/93573851069.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/17519504065.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/18271795850.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/fiteka.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/dijixatufomus.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/jijolasatorad.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/21265258058.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/23475386458.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/19832002000.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419d7659e7e---toxujamulefunigexori.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210902_D7328657C9A68028.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_off0000c2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E7 16696 bytes
SHA-256: e4ef922f1f9fd13db2086ce5822f9c6adbb6096dd9776d30f8c0b8b0b078d05e
font_01_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 10204 bytes
SHA-256: fa3524cad365c6b87d7a230e2a4bb267084e4554869b8b0c32a25cec23897f19

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