Malicious PDF — malware analysis report

Static analysis result for SHA-256 0100e8fe2fe766d3…

MALICIOUS

PDF

171.8 KB Created: 2021-08-16 14:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 2ea95a3e488e7e46c14bb30dd9f245bb SHA-1: 4ff8d2ef0882263e5131dcb642434076ae6ecca7 SHA-256: 0100e8fe2fe766d3cbb0748c939b7b722c4235ece3eb43da1a4b9ccd273f563f
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://asiavent.com/UserFiles/file///69735602354.pdf In PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee982e0c1---60799336447.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b32b8f6f---50481395076.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021080223562281.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/riloxapogex.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b10ddaa06ce---47418258478.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/sozalesezedulesagofadisur.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607723a2089ba---fepiboxazipulop.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7ea9f185e---sotisagutetowokenutopabo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a6a184171---wewilamibedobizidaminusu.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/69310567506.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/2638582151.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/pujotixufarogukivuxapa.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/futuvutowutovanozawuwazo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6e306a9bb0758b8c8412dbca76b6f245/19339410691.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d057f356---gipulu.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/8771619291.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8f7ad6bf53eb8f64f26bcfa373044316/44847843127.pdfIn PDF document text
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/34150336327.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210805085639.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/fapukunidovolinufogobopus.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf69b9464b---79348629949.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/gm9vgdj7vfr058p391b96917b0/ligoseditetipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=c+language+pdf+books+free+download+balaguruswamyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000227b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227B4 11216 bytes
SHA-256: 807148aea0f7a960b3eca19b96c3814c6e61c502bd364ef5a7e68f02a392cc00
font_01_sfnt_off0002419c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2419C 16068 bytes
SHA-256: 626b7c8f39d92c15a08a3ca4bc52fbf6ba2648b461fd8ff24e7d9852eaf99fa2
font_02_sfnt_off000256b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x256B4 18796 bytes
SHA-256: 84375fda547e9dc4ea408d95c31e9e812676e5cf7d0b224a9acf1aae53cc8800
font_03_sfnt_off00028864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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