Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e56469d3f3f78e7…

MALICIOUS

PDF

89.6 KB Created: 2021-07-02 16:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b6e1f98ed2bd5d3562af6039b71d53d SHA-1: 817195806ea02f1113c717a828b0f3d99d8f3566 SHA-256: 1e56469d3f3f78e721d9d8cdf607d67c56d45ca9ace2e5d39ff807bdccba704d
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised websites, specifically WordPress upload directories, indicating a link farm or phishing lure. The presence of these links suggests the PDF is intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901a5e917bb---fuxobuvumodixepufekigogox.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/01c01727b8d6e02a1acf29f0f164979f/85599250028.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d4ac1861---54576327024.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160808b45b142e---69616814630.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b1db6936a---60083860821.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6tblu9j9ir047dt1h80vos0567/xalojegunojumi.pdf
    • http://atthaya.com/file_media/file_image/file/2412629505.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/14613109859.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/4c6o3729l6mg83csk3f1447tf1/96687401494.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e72e16b5---59786331944.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/04de42594ca41196beaf133752182df7/58167777778.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc92d3cf3d---kilis.pdf
    • http://botosani.ro/img/uploads/file/85514750286.pdf
    • http://zeroseistudio.eu/userfiles/files/61137885940.pdf
    • http://mamnonlittlesun.com/upload/files/betirorutimuxigitep.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bced035295c---77900963995.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/77d8c34a9089675d08f7f0f480f347ee/mipajarum.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f9d01e508---10519686610.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7dff54c28---9075675266.pdf
    • https://marmarases.com/upload/ckfinder/files/nezorigajigugagadejex.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9cfc894e4---30492528537.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/af07e105c77d3166b9143ea8545bced8/73932736634.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/58693632181.pdf
    • http://unsersohn.ch/images/file/tesep.pdf
    • https://sportsht.com/userfiles/file/minadijamodulimuditodi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dog+suddenly+barking+in+crate
    • 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_off0000fb60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 16792 bytes
font_01_sfnt_off00011377.bin
5821ff62d2cf9054cb7e25bba1c99fad03a4c1b51ec2866652d1ea7004e36dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 10992 bytes
font_02_sfnt_off00012cf7.bin
5a2b7cb264bd1f659cec26a734fb94f1439969bc2937a80eaeb8036058f95b9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF7 16960 bytes

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