Malicious PDF — malware analysis report

Static analysis result for SHA-256 279ee42549e1210e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 21:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 11666603df8084963bf1609ef7998c86 SHA-1: 0431182e7a03f5961852a230375547179357d2f8 SHA-256: 279ee42549e1210e01fa648807b2fa2ad2b108bad1c3c9b941936affcd53b935
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of embedded JavaScript suggests potential for further malicious actions, such as exploiting vulnerabilities or downloading additional payloads. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://businesslife.com/content/file/87646865185.pdf In PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/58748903068.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/11826804812.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/70804967805.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/larijos.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/444ebe920744104266636479672654d3/45041086250.pdfIn PDF document text
    • http://zamgph.com/uploads/file/021145448708.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/revuroren.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/2183697572.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/sidofudefu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/sqfk8ar0j77ie34qp8dtntd63f/14834054557.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/11430861122.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/82295622756.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/90372028453.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16141f8da6d408---94596678592.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/vapugakifojezixukelofo.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/20460939212.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3608b8485---xelomumiwurorovewara.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/kipegoneperaj.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/93838650423.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/tovezufajimafisatoret.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/tatijivubati.pdfIn PDF document text
    • https://electroagro.es/pub/files/bipodaxiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=game+de+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_off0000b288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB288 15252 bytes
SHA-256: 878515ea5e3882e9773a6853d5859dc08cc035b6f11487a0ef3c4d2ebda23854
font_01_sfnt_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 10136 bytes
SHA-256: 3f42d06cffc659e6b350023dd8c27df85ce4eb531d897ed603f4d98c9224b49b
font_02_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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