Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e64f1b8b0668540…

MALICIOUS

PDF

80.0 KB Created: 2021-07-10 09:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15794d197028268710a85a37a88fa111 SHA-1: 0e09c46cda2b66df15f637149430e01556dd65db SHA-256: 4e64f1b8b0668540bb15e7d407764fe2d67a9c87df9e7da318a47c35a904a4ea
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed a link farm structure with numerous URLs pointing to potentially compromised CMS upload directories. These links likely serve as lures to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.2244

Heuristics 5

  • 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
  • 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.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6b5225a0a---jubipelikukemesodubol.pdf In PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/g5jmvuid1gfo6tik2pgg47urm1/61989420008.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba8c61a48d---jubip.pdfIn PDF document text
    • http://ciskmv.com/css/file/zapowinuduvate.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/37a0164f2d068c7f482f62f4e18fc691/zelusogadavaxelari.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a93092b27d3d6e09a4f4e50d68ae0579/86139747983.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/tufakoma.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e40269b5---59692808720.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/faufp2u6n1757919j8pe50uq8l/21894201023.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607249ff46a19---77149772456.pdfIn PDF document text
    • http://akademibt.com/resimler/files/rumowimupaj.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/lisoxuxagatiwuzuvilomebe.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d404926c448---91934821286.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/lazexodozobefezazul.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d632e427de---30185629188.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/62426322838.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609414152a184---zikaworozuto.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/66418848602.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/77990364701.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82b338924a---seposa.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/20757405606.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e99c99870---sajemozajana.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc15088be1e---tamobuw.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/zixinapikos.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/kikutesefinanukematurok.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82b385e2d---muziduximuveri.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a16515ceb---67425863375.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbfa90a726---65777750860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=most+powerful+weapon+in+fallout+3PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 16532 bytes
SHA-256: 44281f65e4dc7f06254001c3da9e5da19a44155a810b0f8974c12bfd2f990e54
font_01_sfnt_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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