Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9257bf121e7539…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 13:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1dcdf64be62e54ddb59a3b8b5d552667 SHA-1: 41645af2aa28015c93e501a054ee53126b6d2a66 SHA-256: db9257bf121e75390ffbabc3ab7e0077f5faf4ab6571d6a2cf94c5b2dc185bbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://krisoc.ru/uplcv?utm_term=how+to+open+zip+file+in+samsung+mobile PDF link annotation
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614207da83f74---98373615564.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/cq54j3fgvdq2bsnk2fqqcefkap/niximazisabevelupinujiwuv.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/74203255635.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/vajamigejaxiwejamivideko.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/zifoniroloxolare.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/57317752910.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390dbe08cb7---figaluxegitazepojokap.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/bogunisa.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/13898526594.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/niramumepaba.pdfIn PDF document text
    • http://pk.mo/userfiles/file/99205725291.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161493dc174de6---vexidikowomibunu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d31ac9d067478e915cf301219336f7bc/66067240346.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/40476551054.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/tejajajowon.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/89785780212.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/64353596022.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614644f2684b2---15344642378.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/95657146695.pdfIn PDF document text
    • https://bak.vn/upload/files/71395645756.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/nukosobofebizopeva.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/96f082978ea03ce13172c9149cc119b6/sazimukisukutajap.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_off0000add6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E8 14720 bytes
SHA-256: 1fb26a00f9ffc4ecbaff2f5fbe4e18dae0a8ef36612b19d9bd4cd887d54acb06
font_02_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 10976 bytes
SHA-256: 6b64a9c774b4b646431f31b2d71ad77e6fd9c3b9f2c04699f4b67a5ff97d6ac6

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