Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d83db5c5857a16…

MALICIOUS

PDF

77.6 KB Created: 2021-09-15 03:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b7200ffb4a337d2fc6bb28048c429c2 SHA-1: 686ecef9394778a127416357af513e72b5c7c4de SHA-256: e2d83db5c5857a1685c464ec50227874a4f2b8b4fe4715b321cd3ecc865709ad
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://restaurant-lyons.fr/userfiles/file/62950856555.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161319bbb2df0d---86794529728.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/pogiborekipanobulemidudi.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/rafadibumivid.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/wikewikuxaderezefili.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kb64ffv6v06d7h5pis83oe56nj/wavuvi.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/kejuregitaruno.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/12367922200.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bsitlbfj8p3s6bgqcc38uon6ei/76252346284.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613590fac5569---7060938217.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fb544a707fe1996d766317006149a1e3/jotajatisozufapidak.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cef1cfc560a3c3f2721bf8faeeeb44b/nidofuwuwiripolinuraje.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/vowinugunorowazezevafezo.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/97120694619.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2f10bf9a---jozudowidakufi.pdfIn PDF document text
    • http://afro-safari.com/upload/files/3912090038.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/zijuzexirulipabamusu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/lsmaf04f7gmu6t6gpj8pj3i008/57526986383.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141386e1a078---lugozozotejudu.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/dipaxolef.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9e2d32e2d1a434b5a552db8dbe6bf400/tigafivubibupijix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=slash+keyboard+apkPDF 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_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 17460 bytes
SHA-256: d7c7499c1504c7128522f34c2b99c8052ac6a6d78037e0960f06b0a4e24905d7
font_01_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 10616 bytes
SHA-256: 3ecab26650918c256d6bd7ed6fca2fecf048288a4897d4af493f8857afde6f53
font_02_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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