Malicious PDF — malware analysis report

Static analysis result for SHA-256 500c192a56c9c8dd…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 13:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72bec77d851edb5debd1e02967af689c SHA-1: 3f82c86ca80cb94456b4e6aa64e72fa5acec5937 SHA-256: 500c192a56c9c8ddc07ced01686a0c00ac92bdfb67e9e36a55e4ccffd9200bb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, directing users to multiple external URLs, including one that appears to be a phishing lure for 'wifi password revealer'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to facilitate phishing or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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 https://coretry.ru/uplcv?utm_term=wifi+password+revealer+for+android+mobile PDF link annotation
    • http://vektor28.ru/userfiles/file/7836433221.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/37097663546.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/51916485729.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143fc3722635---69928240215.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/37107674524.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/nuvatemafedupekesib.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/mujowewajudojafezuj.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/wijujokiritinawog.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/17615898064.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/waruguvipuvuzejimoweto.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/38211378752.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/27638319557.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/4251827202.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/puwumoladosomiwedikaw.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135eae38f217---wurewiwiduzidogemij.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140d65e76de7---xonavoz.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/wewivozibeje.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/kusuba.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/83324779396.pdfIn PDF document text
    • http://agro-partner.com/Image/files/raluparabefekez.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/ribiragidamewemep.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/72671404444.pdfIn PDF document text
    • http://wjcopy.com/upload/files/56657045851.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/45152867879.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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 10848 bytes
SHA-256: 5205561de6ff9a923b9934730510d2377d86989c9ef94158c7110fa7c0a89bdb
font_02_sfnt_off000114e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 18140 bytes
SHA-256: 440dfc101655b07206caaba5387cc8351d8c26c2804255eeca04a79d557c5a8f

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