Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc19ffeb7715130f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 16:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 48b72de8fda86661984d6ff2e6b516df SHA-1: 6dc2208cca677d459892cdea733efc3b03ab9cb2 SHA-256: bc19ffeb7715130f9012e5acb6c6ce3fc6b2385f4294c2b120d46a816c5dbe3b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=gta+san+andreas+free+download+mod+apk PDF link annotation
    • http://lnianemarzenie.pl/userfiles/file/22854550221.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/71427496816.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9089fa8bc0c8fad90d581cfd759aee03/2007671341.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202108311857063645.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131c829c5175---kesosizilokun.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/52099944725.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/62324826759.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/xaxinorododipedakilix.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/57068907392.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210907_505EF930B478F397.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/77751738800.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/1399944608.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/wekoredetuseweligovul.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161372b85a34fa---30874313346.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/xunit.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/lagaxezuwalusex.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/fizofi.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/peleji.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/70821569869.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/60862335874.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/bijope.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/pulofavesafesafebalamaxad.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_off0000d55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 10784 bytes
SHA-256: 06ccdb9fbf32f794cc4761495850ade0803a95314dc8f629e2747b905f0df7d7
font_02_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 17700 bytes
SHA-256: 25c1a128d42c8f773e6a940d0710823df3e9a848e0520faceb6b1ce1c62d162c