Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7befe24b9f9c7f…

MALICIOUS

PDF

86.2 KB Created: 2021-07-04 07:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6d6b10d8a2fa28bb6f3322a23082dad SHA-1: ca92448f8e1bda30c6c38a37bd1246dd579c6763 SHA-256: ea7befe24b9f9c7f8d9eb0c241f54efdbb9a3494dd858abe60696c18f7a0bebc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of a link farm on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c352307bc78---xofekekarik.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/n88d1vjg4sn6duk9k07eac1b50/32246310686.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/88d9526de0c79e7a18628e83a0cfa73b/74530313648.pdf
    • http://cec-intl.ru/app/webroot/files/file/lomobujakonuzulam.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/55749071917.pdf
    • https://iuoshili.com/upload/users/files/2036113609.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/60ca463912c59110e85c2683e40c10a5/gosowumaramirefizon.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fcb584ab3---84715585583.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6f5eb88e7---xusununeb.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5b0f89a4a3cf1d1b92c33a0b473c3d9a/jezoserapubov.pdf
    • http://albarossa.jp/js/upload/files/86402461230.pdf
    • http://hrjok.com/uploadfile/file/piboviruwipiruxifijes.pdf
    • http://bukhatirhomes.com/userfiles/file/90308770999.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/31iv03qedjuhhaptmmqhijfqtt/95191928003.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/vovemewukexok.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b28357d302f---64059509392.pdf
    • https://weeb.nu/userfiles/file/pelutolumedawefasiwigu.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/nesokoraketabopufakenuve.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xuzeripax.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26c417190---kurugazedavelegunuje.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c10146de833---49705409923.pdf
    • http://jr-bang.com/uploadfiles/20210610215550.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806f01be620---dafit.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=personal+injury+practice+management+software
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe8f43562---19455272906.pdf
    • 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_off0000eaf5.bin
f018c3ee6505fe4fea07c2c1210fbd6e93fd7d388866fd0627b8c18cb0ea3a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 17364 bytes
font_01_sfnt_off000118ce.bin
908feb1143309e022a17afc62a399ebb794a9a8e5a1e170e895a1d54b98b1151		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 11252 bytes
font_02_sfnt_off00013344.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13344 16792 bytes

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