Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d50981a4e342c7…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 02:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d77c3417e269eb527aaf170eda9907fe SHA-1: 1077795a43176148b36edc26280cffd3d65e1c0a SHA-256: a3d50981a4e342c739419ba6018ededf7920a6d6db84d412bba24b52be54fdef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=how+to+clear+all+cache+on+note+10+plus PDF link annotation
    • http://caratow.eu/userfiles/file/xokasitif.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/806b6fa55ba787a76d0cfec5a5198de7/23167235440.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/34526607823.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kejarajirokedizor.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/80211891246.pdfIn PDF document text
    • http://hzqzg.com/d/files/kutidoto.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/wonilanox.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/fimet.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6130385f991d2.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/forekixebab.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/relunaketovikaxatubu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ff7c2bdb67f6083e7625055a44aba77b/54647614835.pdfIn PDF document text
    • http://jaqalsports.com/files/file/sumuzi.pdfIn PDF document text
    • http://screen.by/images/file/xalivu.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/83011436506.pdfIn PDF document text
    • http://momsystem.ru/public/file/zimetineteneg.pdfIn PDF document text
    • http://packturf.fr/files/nitegusirefitivewasusu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614b012339fbc---mufanonamenekewitida.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/ribofakozupipopev.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/forulezodidupetiriwopagew.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/21538445426.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/zuxugamogariwuwuxosamuvu.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/xukegafabubiwuwubam.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/nujaletifagurizifekulopu.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/kolinofewetanamajavonavaf.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_off0000b227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 17368 bytes
SHA-256: a77997a0628113124361475e866997dc129ce93579676dca28aefa9d095bf952
font_02_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 10732 bytes
SHA-256: 98c8097462c3b73e8d8d1dbefc53d5a935a99c0986eb400c3d1835a622b219e6

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