Malicious PDF — malware analysis report

Static analysis result for SHA-256 9920a69a0c29a01e…

MALICIOUS

PDF

92.5 KB Created: 2021-09-01 05:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ffae26222972622bb68e45010bb946d SHA-1: c952244061d1f21e586fd2662c83b21df9712921 SHA-256: 9920a69a0c29a01ee8c6c911bc9821d708da76ca8fed03b3f5227f4ed2101b4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://4chan.ro/UserFiles/file/44201275635.pdf In PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/nuginavegilukuwovotulut.pdfIn PDF document text
    • http://wamer.org/userfiles/file/zaxomawuzab.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6f6a73118a95ebda2bf9b1c7330906f6/43929217603.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/15258548337.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/tefox.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1629378097.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/lonad.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbbb54939b---jofiwa.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b888e101e0---26856769155.pdfIn PDF document text
    • http://digifast.cz/userfiles/32973237768.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/razulejudugumavagisogok.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/dowidofarezitikokuk.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/df25b5da8570465b41926daec16fd731/61818476829.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/61686946282.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202108160232142566.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/kk0sqft323sjoqg4fvvsaq2pkh/93682255344.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/99689104858.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/bojokezowij.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/10218227887.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/kanarato.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4049248a55ed07419b4a8ff4599c589a/11092580691.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed71c4b60---15918873191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=feedly+export+opmlPDF 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_off00010486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 10220 bytes
SHA-256: 432340e0139b9773e725c21cfe07bc0419e62d6c27d35151d18d995191431210
font_01_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 18552 bytes
SHA-256: c6f075f084f9b58599cbed4f20b95d61c76122fc61bbbf4c88f659d57c3fddc2
font_02_sfnt_off00014b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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