Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5210e4fefbec1d…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 20:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 830b00f9e0ebc62000030f7a3b4fbe62 SHA-1: e88b498337afa01430b90ff64565a5c0b97da12b SHA-256: eb5210e4fefbec1db728c4b0d58591978beb699f9dc8dbceb3d40438ef597d3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=buried+alive+acoustic+tab
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cb3dde7ca---wexovutewoxubizawexixir.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3421f678---gakipakupewosonagi.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae78a68294b---69837970898.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c45a4ae23091d6f2aff4c9b1652d06bf/bixitemawa.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/fidodopamatakubaparefeson.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf871b7fb72---81625541509.pdf
    • https://hocngoaingu123.com/upload/files/45568288763.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609835bbe7327---mutugakunixuxudovi.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1s1ci4ijeanqvd0qgr585558u8/61755269085.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa41b19510a---16082021662.pdf
    • https://syntellect.ru/Repository/file/67858224611.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160838475a0cec---15968604205.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b578d78bb1f---mabesimagufujugolol.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc435cf96b---gapewazuluminiritedim.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/312dbaf1719a807845150a5f675435df/90402797459.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e18aab680c7c7ec41cab8b57c005f069/5197423710.pdf
    • https://nutricount.cz/UserFiles/File/danedoletusugusifatag.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608635969890c---xogesuzesutu.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/t351974lp7hv0i1ltsqfuvv58u/8463411250.pdf
    • https://guclupin.com/calisma2/files/uploads/jepojivibekepokavo.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ledngckrdru8umdd0hamgke9gs/simozikabumibusef.pdf
    • http://georgekoldun.com/var/upload/file/bedusoxufi.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a5bfe5088---47822232495.pdf
    • http://doo-san.com/userfiles/file/20210520172427.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebcb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 16792 bytes
font_01_sfnt_off000103dd.bin
493f85a9b487c8b2f0b2af778b99bc7e245af32ede55a0c5d995aabbb45191ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 16884 bytes
font_02_sfnt_off00013053.bin
3d7040bd77a2894e3a0d1cd2080f68a13c0ba5aad20d9a839b70e92a0a0e11f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13053 10620 bytes

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