Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c335fbcf02dcb3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 14:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 709540573e2e37d25b60f5bc65c8594f SHA-1: f39cad8dee703e3e11571b42e6b0780431cdcf80 SHA-256: 95c335fbcf02dcb3512e38d8c4917b650d0cf2217793b6445c6ff5d042f9c206
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://livres-arts.com/ckfinder/userfiles/files/67400547704.pdf In PDF document text
    • https://vibangnhadat.com/uploads/files/51057572505.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614855782e5a7---vodude.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/binumewonidas.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/24180965361.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/70989150806.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/71573008902.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/wiletupanizukunilixe.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/lubexojoruserofad.pdfIn PDF document text
    • http://kes.org/upload/editor/files/dazowuba.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/jozirikazakokonelop.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/49115656295.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/zulewuj.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/50082512076.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/89037967905.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fd985938d---fumatilubelapuwusilo.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dobeniwabalibovox.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/sogupokojiwopana.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/38280283194.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/todexinopa.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/kuroxa.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f968b11ebd---rowus.pdfIn PDF document text
    • http://dominant.name/userfiles/file/6824782305.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/19371078452.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210916051922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=paper+dot+io+unblockedPDF 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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 16872 bytes
SHA-256: 81992037787b1fb50b2c1c2d0f6ae4415937bd81b8050e43bbc79366fa67e896
font_01_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F73 10672 bytes
SHA-256: ddd37b5cf42804450961cb806de8f0ad4cb8525b94e09b2f13b41814046a5811

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