Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b16b63da39799e…

MALICIOUS

PDF

97.1 KB Created: 2021-07-25 15:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fb075987047c5f76a06587ca09edebe SHA-1: 1ffe3b7f1794aacd5a865090d2ebb093ab172488 SHA-256: 57b16b63da39799e6bd2a1d6a1e5e030712cb3b5963a370efe2946baaf3fdef6
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6152

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 http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7efa861102---lomofutugazakegobigejo.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec58c817bc---tozisonipimetoduvusug.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a30cb48b6---61697970317.pdf
    • https://northwestconvention.cz/data/files/sezajugi.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/94168076049.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/383afdc155de20d5f3267f45b020a022/vafepufumiwivosukakefiba.pdf
    • https://arzhosting.com/calisma2/files/uploads/65510046048.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd6ad327f11c6a46f6ba7cb6c3cbc418/83527891636.pdf
    • http://bike-aholic.com/UserFiles/file/38199308873.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0f09df7d5---5330021168.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0f24b64c101fcc92037a12a0eda80001/vanazarinekuzejeje.pdf
    • http://cuatro-pr.org/sites/default/files/file/fonuvik.pdf
    • http://lamekatus.com/uploads/ckeditor/files/wobujigubarewadetidux.pdf
    • http://deborahbrown.us/clients/860103/File/wanaxi.pdf
    • https://theatresaucinema.fr/uploads/file/mavopetegisizutidomolux.pdf
    • https://rrr71.ru/upload_picture/46676805680.pdf
    • http://mdsalon.ru/img/lib/file/89223186706.pdf
    • http://nexxosrealty.com/userfiles/files/nugatavivajijapulozoz.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5630af0091---xazasejemokosagaxiru.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccb4d6eafa---71271592125.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbcc91b0ef2---8959006165.pdf
    • http://capmar.eu/userfiles/file/rerovifaxadapiju.pdf
    • https://raiporjai.com/piceditor/file/linid.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609690840f3b3---16777523211.pdf
    • https://hanmarklight.com/UploadFile/files/59223230098.pdf
    • http://3dprofi.net/images/uploads/file/nuzizixupetitajife.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=le%C3%A7on+nombres+jusqu%27%C3%A0+999+ce1
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000148e6.bin
8ab65c90f019fd1b13935551c5ce61d4700d11e1e3bbc890743e3db1d1ed01af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148E6 20732 bytes

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