Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0478f0d15c1ee97…

MALICIOUS

PDF

78.1 KB Created: 2021-09-23 21:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f6747d07bea0b916d4c74ff51cfceec SHA-1: f163fae27ebfb4f6df9de6dfecf11db1519181a9 SHA-256: f0478f0d15c1ee97e7f280f79dc1ad9caca409bd0403b6e7189fa87f3e0e03df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://queure.ru/uplcv?utm_term=how+to+enable+usb+debugging+in+moto+g5s+plus PDF link annotation
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161306d95c7d5b---37798298848.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/25791359574.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/gibepesifal.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/dofirezom.pdfIn PDF document text
    • http://fedime.org/imagenes/romelatisovavavuxaj.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614219294e7b1---10075990899.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/waramepiwikenibu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148980235f42---8787055117.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/sazopetanufutoderi.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/89118987487.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/sqfs57ficjerqv5h5mn5mrhg2b/21623187120.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/84346561656.pdfIn PDF document text
    • http://dasbluemchen.com/fuvotumoza.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c38675b604---1121410531.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/76651898543.pdfIn PDF document text
    • http://knipia.com/userfiles/file/16172813400.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132214e9b5f5---bufemi.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/xufaxalesamasozekarilogi.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/41818002085.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/71bb032e31765cdd9b83b64eebe76305/pejomawagogezodovejege.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/21651014046.pdfIn PDF document text
    • http://citranco.com/users/files/kuburixofi.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/99458574331.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_off0000c99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99A 11084 bytes
SHA-256: 801e87c77592d8da2406c55ba4104de7c493da785cc81b3cba460d7e48f9e35d
font_01_sfnt_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 18432 bytes
SHA-256: bcdf85ab722c78d193cc0f7fd086dee8979659e6a7b333c5011d86f2412dc015
font_02_sfnt_off0001128b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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