Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40d8186929ad66c…

MALICIOUS

PDF

83.8 KB Created: 2021-06-28 16:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a834d6971cc8be75a09bde4780255ad6 SHA-1: ede66ac7c402854c5206367039172815510d64fe SHA-256: a40d8186929ad66c23c9a2ef5ae3273b1b42c6e8f7606d127df5413361341882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ajivikafinance.com/userfiles/file/palibesunewunejewurumo.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a86394b2ffc---68873544053.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3bhk0h8k703oamikvhusqjplp4/59218656085.pdf
    • http://nhhs78.org/clients/63854/File/pilidixekozizezofel.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bd377decae6796e7e2b98bb441bdf052/jajoroze.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/da2dfcab55ef9d650dd68a6857d34bfd/numalukeponomogusilipebe.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/69377f1d7ef1e1526adf3903e7a31ed7/36151664299.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35bdbbdff9---96157498958.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070be3285e61---5955040133.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb57ab23ab---85244587080.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca09196610---87154434194.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/0kmmov76odfbv9hcogmgf4avd2/zidarufofamalitutoxatidox.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e29d3905bc0530ffb61208df5faef7c9/44397054066.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/52a1a4d449cdb503c5fd51c411d88a9a/49412029630.pdf
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/41840086056.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/ua5kprfmo20ors7u5rktp89jcd/midurakesusi.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/muzewo.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9083443bcd---vilutokifon.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fcd3b469f1fa0edc58eb027c30ec6307/zimasibazetidateke.pdf
    • https://airshow-bg.com/file/30245454590.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8be2041789285e6c41aaacf3b3592006/riwado.pdf
    • http://hongshengfish.com/uploadfiles/2021051222322426972.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=school+nude+day
    • 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_off0000e851.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 16792 bytes
font_01_sfnt_off00010068.bin
d1e5d6936933286d3e646354ecb4b66f9565d6e5a483e3787689f2d57c50a8d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 10296 bytes
font_02_sfnt_off00011790.bin
d2dbc8a94dea06e5e8b8c9f792a1b37ab1bcc547277163d7e5d7d368de94109a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 16760 bytes