Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86ea92b65d9960c…

MALICIOUS

PDF

68.5 KB Created: 2021-09-13 02:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1830157a5f67e4908cd39bbfa0e2eb4 SHA-1: e64d6af6200f72491a1f8c39863513122f1fd061 SHA-256: a86ea92b65d9960cad09e532d0cb36cfbee018b883f5611f61ca9d9559db321f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external PDFs hosted on compromised or disposable domains, indicating a likely attempt to distribute malicious content or phish for information. The presence of a 'link farm' heuristic and ClamAV detection further supports its malicious nature. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mackyz7automotive.com/js/upload/files/livesawawogisoruv.pdf In PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613476d129d07---mexevutuk.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea11f0024---fodogefik.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/bipopejigiwofef.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/getirimumonirureluwonago.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ssedaac32t138bssbh35tkh73g/dabilukegaj.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/10544063354.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/65647936553.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613158bd92054---31851389004.pdfIn PDF document text
    • http://hingliltd.com/userfiles/vuxozopafolan.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/63746071117.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/95190096173.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/53688817575.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/91526894888.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/mijifibuvifo.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/wupadokitixo.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/budukabidudesutozaloked.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/98945014101.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/29780414608.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131591100f45---selurujasozeliposovexud.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/89543037630.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/3706151375.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210906182253842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=xbox+apk+download+for+androidPDF 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_off0000b022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB022 10520 bytes
SHA-256: 7ac3e7c3b7097b547db09c9013438bcf68004451e5f992806373dc435cf6f5d3
font_01_sfnt_off0000c7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EA 14824 bytes
SHA-256: 9dc6b466ed4aa549a73a4649b3b613aadab8bb9693f9cfe271750b772010a4f0
font_02_sfnt_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1