Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc28fc6a203d07d…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 13:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3159b219311aea154a1c2b7e7af20a2 SHA-1: 11fc0475b367bad5aedf4a0d7f11b4998962312d SHA-256: cbc28fc6a203d07dfaa2e23f308428aad840922b89f03ef245b731430a93e451
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to PDF files hosted on potentially compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to manipulate search results or distribute further malicious content. The embedded JavaScript likely facilitates the redirection or execution of payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://banghetretunhien.com/media/ftp/file/mibabagafunosizin.pdf
    • http://coopmong.com/ckupload/files/xuzakepenor.pdf
    • http://high-keenltd.com/userfiles/file/semevuvobijojikipime.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083210411ab1---62597060777.pdf
    • http://kapsalonvogue.nl/files/file/rovukoregojukamato.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a71ef1c0d---nuketalapi.pdf
    • http://mahkotacare.com/tmr/userfiles/files/bemesox.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3f88aeda---6441079635.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/nuxakijitomosafu.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c3e11949a15c0915db5ac048fa6a8398/dakilaluganuxugikukitexe.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/jabiwepazotasonipovej.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bee524bea---suzufukavale.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf2daaec3e---20479331355.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfde1262ebe---17706939509.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/c50f40d630e2153d7837656e809ab966/23376192898.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f245d285---nevinoritol.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/dmcmgo7tbj4lfcbq3b15ksuh73/pafuxuwujojixifakojarubem.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8a4fe61ddcad694a99d6f27ac7e86b9/mexukikesedurumozubo.pdf
    • http://guerrazzi.info/userfiles/files/jejug.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/dbb374e41ae6af39aa7d6248bc92347b/76048161602.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7fff2885a---fudum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=directions+to+nauset+beach
    • 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_off0000ec66.bin
959edf0c7533d24340083c532752620702ab6403da7a9833a81a6ed59b966701
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 17552 bytes
font_01_sfnt_off00011ae9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 16792 bytes
font_02_sfnt_off00013300.bin
c221056f7d6225d466add2444d092fcb41769b9ea9af5c5dd9a581bd88b24400
pdf-font-stream PDF embedded font (sfnt) at offset 0x13300 10520 bytes