Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e1811027b6d854…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 17:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cfc171817130e6ed3947f5caf9b1cb8a SHA-1: 05f49a6f3443d1aa2c5f2f2ffd9edf7a02cfbfcd SHA-256: d0e1811027b6d854a3b042480da0aeb703e4244ac24e5e194baac9907cbdef70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is part of a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://happyhanool.com/ckupload/files/ronapotewovutusosigano.pdf In PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/tuvinowu.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/lufedilereze.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d47a686e63e4f97888430bcb5374cbe5/63265022326.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ek8g11e2tskcl2i3k2nsiitot3/42986515184.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/fujafotowa.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/201821c2394a31fa021e6514d073c80e/32292487703.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b562804a6---31339416165.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ffea6a87c91a515938896c167f85454c/nezevetod.pdfIn PDF document text
    • http://soupworld.de/upload/file/39779599994.pdfIn PDF document text
    • https://adium.ru/userfiles/file/83987501093.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/tibokonefagugezotejikuso.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/zavusumodukefarajes.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210911140847.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/lomewapilipaviliguje.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5279c91295e37fe5147f8e25de606127/pevekeguruloge.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t4gdti0aq0id7flbodo80rfcnf/14819268948.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/popexituzoxoberobitijokix.pdfIn PDF document text
    • http://generoussecurity.com/uploads/dudubon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+close+instant+appsPDF 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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 10344 bytes
SHA-256: c66cb85dca6b53d1041f48aa914a065697753a04fc38db0d2e9cafc173bb738c
font_01_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 18348 bytes
SHA-256: b34fdfa00b4780eb50dfda105912629c65708b2c7d94428a513d530c3a183312

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