Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0a5cabe76405d9…

MALICIOUS

PDF

73.9 KB Created: 2021-08-08 15:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54a4b7118033ee25c39e472c037e456d SHA-1: 12882d0ce77eeedee691bd0d87490d2747653826 SHA-256: ff0a5cabe76405d929345941f78c9547f106b78ccbf6dd1f32f3acb5e3974d91
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits PDF vulnerabilities. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or compromised external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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
  • 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://usaoxin.com/userfiles/2021-8/file/pezilesoke.pdf In PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ae38be84a---55669101215.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/47615424347.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991e13d00a7---28937223784.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/89521000972.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b134a94ce---vonewevasopelipusipezo.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021080805245347.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc33ec6201---62730471476.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2f1d84aeefe24316c7a8a78e905a710/72119393759.pdfIn PDF document text
    • http://amandamaitland.com/images/file/16248942865.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/joninolasawidigutozoveru.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/48005706053.pdfIn PDF document text
    • http://614move.com/clients/4890/File/81648535311.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b245de40ba9---nekisulaki.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/0jv826199o2bglh7vfsgs9a9o6/bivevifobivaxuwakifivi.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/96103525291.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210611_144203.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6c17e3f893f9a952bcf01748692c669/suxopuxetefif.pdfIn PDF document text
    • http://alltechsro.cz/files/11118780731.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5b898b63ddb88198656e19b4cdb441e7/pamogojawupukidevi.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/jdhc02c3qsu92jh1ib3ke3u3p8/6268974536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pearson+geometry+textbook+answers+page+394PDF 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_off0000bcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF7 16332 bytes
SHA-256: da4e8fee15677dd6a2e0b20ab0d4991ed5fbd799f8ce8ff7b002bdd754367615
font_01_sfnt_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 11408 bytes
SHA-256: 9c111fabae2c071c48fa863b71a53429b902c97de1a7758307b6d6c835a1b6d8

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