Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df19cb82f525ec7…

MALICIOUS

PDF

70.2 KB Created: 2021-09-02 05:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e96bb18750aca66c3e64569f101dc4a5 SHA-1: 8d33ad09324a9a635387ad8732f1b9259050540b SHA-256: 9df19cb82f525ec75bf53856acd7ab2dc6cfcad28304402e3c14ee6e26a58454
164 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV as a phishing trojan. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The PDF's structure and the presence of JavaScript indicate it's designed to exploit vulnerabilities or trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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
  • 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://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://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_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
font_02_sfnt_off0000f061.bin
d22887b89fc8fe82ebc863b0228565767aa04d5c47346771f83f439aceda4e48
pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 11384 bytes