Malicious PDF — malware analysis report

Static analysis result for SHA-256 6843c00467fa3576…

MALICIOUS

PDF

84.0 KB Created: 2021-07-28 07:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b36ad4847b2389e9848598a1ff1658b SHA-1: bccd13a04c987a1108a956c29f89c392ca01ed07 SHA-256: 6843c00467fa357636a84565fa5fdea008f41a40235fda18f184f8ab0b392d3e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to compromised websites and disposable domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://asustainable.com/global/file/62389348757.pdf In PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/17cb655235df0303705f418f285eb8c2/korivalagivel.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f4cbb6371df---lofutugojureno.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a51bd13b6c2---pojujifiredixiwewivov.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160e840dcbb907---madotasejotajefanejuv.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/57852546575.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/64490924538.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/dosexafiz.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb383a2d5a---15236016146.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608456fee76d0---49905938019.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9787ddd584---gumagafosamelelijuzesej.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/sd3vjsnr9sgfl96suu8j70fo80/rizagipupawazam.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4052fb38---lunukajakimemezawarabuja.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/28050752829.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/j7nvvv4366qsmnf5ibfkvf0sl4/27514349918.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16083651e3dd75---laluzopazapon.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/68ltiaikmo179hkt9n819srgvh/43049074125.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/65922244889.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/91986394335.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/29292378864.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/6uccuj97of80bngk0r2v1lspjs/voruvalovuximisuxavula.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/lujof.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/k1cf3cjm63t12sr5aj5rlnkpvp/39355964324.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/dilavabatalap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+duracell+battery+is+equivalent+to+lr44PDF 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_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 16772 bytes
SHA-256: 695539e7c992fba3ee04e0b7458baa009d768c64b5c971364dcf02116ad9f0de
font_01_sfnt_off000110b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 11104 bytes
SHA-256: d7b8e24dd814404a20b4d195ba70c36a03e41529b7d146f237cef999dce02c56
font_02_sfnt_off00012a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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