Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d510262e53cf9d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-08 22:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d5aec966fe535255f834f98d0635a62 SHA-1: 27a4ff4e04effe790d4f4ac9aa9d3710aa2fdbe4 SHA-256: e4d510262e53cf9d3771bc02df62a2ab188bd400e4cf7177cb6d75b2fb25a945
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a link farm hosted on compromised CMS uploads, directing users to multiple unknown URLs. The embedded JavaScript likely facilitates the redirection or execution of malicious content, contributing to the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613439c2c844c---volonobubawesoxixojobef.pdf In PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/39991992251.pdfIn PDF document text
    • https://actorconseil.com/files/file/wefunelowaga.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/lesogujidobumetepavufuj.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/11948972234.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f879699e9b---zimifazodopukovaxo.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/goxefosidofulizezosu.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/40553887107.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/17942299415.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/77913300854.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/demefobilakor.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/70195296326.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/lapufupezotowamo.pdfIn PDF document text
    • https://clove7.com/userfiles/file/23111948911.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/95310830167.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecfa72ca5d---3002059926.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/sixuwasukarewuz.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/mowutu.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210904070525.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/15086711661.pdfIn PDF document text
    • https://tadimtursu.com/image/files/36097612092.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/wodakinitakuw.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/toxosajisukub.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/1071543024.pdfIn PDF document text
    • https://suksesunited.com/contents/files/81207778606.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/ruzekaxuzug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=free+korean+grammar+pdfPDF 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_off0000b76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76E 10508 bytes
SHA-256: b48beca867a1c268079134cefcad9ec69519f758027fd1792c4a547ef477a6d1
font_01_sfnt_off0000cf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0C 15296 bytes
SHA-256: 5199b35a11c443f738d204bf9d37371b05378c44b7e4b591eeaa3b92aeb752fe
font_02_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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