Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9539c1394c66326…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 00:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f5672f0bb22eba168ea204c24f83bad SHA-1: 3751f26c34736b9c33feb82f4ea58dac6e32c292 SHA-256: b9539c1394c66326ee24ae7e6a037c4055e895846603f6033813aed4e3f33de6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

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://laborke.ru/uplcv?utm_term=battery+ka+apps PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6bdc2daba---58453692762.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/17307021389.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/zuzogobafixefudawidagafi.pdfIn PDF document text
    • https://mihalex.by/files/files/nevekewajo.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/jokomuzugubatipolaza.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/fagidolukunomejiguv.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210912212230_1165422255.pdfIn PDF document text
    • http://superazs.ru/images/news/file/nupevak.pdfIn PDF document text
    • http://htygroup.com/upload/files/47687764386.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/99741051496.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/68375537381.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/23768905071.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f34c5c28ba---fuleba.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/rejal.pdfIn PDF document text
    • http://arsvet.ru/img/upload/roxaruloluxa.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/kuwamulumilojimag.pdfIn PDF document text
    • http://foodchemsino.com/d/files/kexer.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/kizopiguxuxep.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/16493299341.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/7973949655.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dirakufiziberimisamubam.pdfIn PDF document text
    • https://nevisnews.com/userfiles/nuvubomitosemul.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/rawojebefiliki.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394c761075---9354345094.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_off0000d1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C6 17100 bytes
SHA-256: 144d62f624221d4522a422ab5762b6ae3d637d6849b2482da392b186edc92e20
font_01_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 10140 bytes
SHA-256: 85919232a73113f1248f1777363fc9a8fea26a873398295fafb5b2fb569141e5
font_02_sfnt_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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