Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8f956588959405…

MALICIOUS

PDF

60.9 KB Created: 2021-09-02 05:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfb0cba928952b2ba63965fdc2ed1abe SHA-1: 10eb4acbf603a87d09e1b10c8879b83e365cb779 SHA-256: 8f8f9565889594051126ef22211b8d017c8c3b156a11e38c3c7f06d07481ada9
162 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

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.
  • 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
  • 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://soeurs-scjboran.fr/soeurs/upload/files/sutuvotesuduvivetajex.pdf
    • http://cayxaotamphan.net/userfiles/image/file/95149262416.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04d8d0d237---xibesekonokiw.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/179c6dc3257bb0c1580fa8cd991aad29/35213463344.pdf
    • http://bienenaktuell.com/sites/bienenaktuell.com/files/file/nebukarifakite.pdf
    • https://fwullong.com/upfiles/editor/files/16865525723.pdf
    • https://ancoraeducacion.com/images/felupoxer.pdf
    • https://autoprofi.ua/userfiles/file/febojozevajuwuwu.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cde69c6e987---rozuroje.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7cm3c4u370v4dcnbdtgfcami30/83342086362.pdf
    • http://mientrungland.net/uploads/image/files/62807352870.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/47057511236.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6a3984e86---98571993483.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/0u0bu3codjf58mhbmqr197m334/xuporevokiz.pdf
    • http://stylekd.ru/files/61410005773.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b4ae5c4a770120c9dcaad6fc0f6b85eb/laserolomutexewola.pdf
    • http://coreaad.com/DreamDataUpload/file/88285374450.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3d0005871---20402339037.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/dc4587410e3737e3c1defe82b6a67cdf/rolemosetaz.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/o9sjamdcbglnj66iuuoh80jb5o/84986221863.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160940b624c71f---29254571085.pdf
    • http://ahxxzx.com/userfiles/202107/file/31300948300.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=powerful+quotes+from+to+kill+a+mockingbird
    • https://easyown.ddproperty.com/datas/files/kewarumudonegomameji.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BA 16792 bytes
font_01_sfnt_off0000cdcc.bin
c4cb003f1756d51cc93f6ef52c5b3a76eb4a69bacc490ad6d03809499206005b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 14060 bytes

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