Malicious PDF — malware analysis report

Static analysis result for SHA-256 b448b3ee2e7c6748…

MALICIOUS

PDF

76.2 KB Created: 2021-08-17 00:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 349550c03b5fcefbbd9a9bbe40b1ac5c SHA-1: 58e83034dd1c8cb64184fbc074dd492db3843e29 SHA-256: b448b3ee2e7c67484d60f11cf0a20aace993f677352eee8adb90b22d35ed9bce
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of external URIs and link farms on disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9452

Heuristics 5

  • 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
  • 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 https://medvor.ru/uplcv?utm_term=personal+development+books+pdf+download PDF link annotation
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad738da2faf---poboro.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a16269cb5---94241708716.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/gedaku.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/315c9105505169c99e85903609533ed4/48480039573.pdfIn PDF document text
    • https://coluer.ir/documents/file/wukasogutawabokajeze.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079146f6c1e7---85618662118.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/dakukedoges.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/zurutitinapenubov.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611819aeb2009---48839856176.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a63086eee44b3b544b33b0d0561636fe/42631109080.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/xidosebilikelapux.pdfIn PDF document text
    • http://promador.pl/userfiles/file/65625161770.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/tanewubaz.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cb818e1b6---57634106950.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/f3430vg983k552js1uju77prf9/nizizeforifugubidiwakufi.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/56be9313fc9b37a01471e12186b6aed4/51935334434.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/58129888477.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5a41cqvgnpepr4qepq20br6al6/nafiwupodupar.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/15137209265.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/9v851s9413refois1hgkis5v4p/zorumanixisowifinuj.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b98e05677f3---pusagerape.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/poxumu.pdfIn PDF document text
    • 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_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 17600 bytes
SHA-256: 6264dd53c8b81170dd11d36da079ef5028ddd02e077353756ac2f32c33554fcd
font_01_sfnt_off00011ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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