Malicious PDF — malware analysis report

Static analysis result for SHA-256 4007747c58e9d90a…

MALICIOUS

PDF

81.9 KB Created: 2021-08-18 06:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bb3bed0e1f80f3bd03598fb93627061 SHA-1: 390eece6dd15a7ab48b9213711de521bf2a8e057 SHA-256: 4007747c58e9d90ab249dfcf72a0c9b2d86355e91dbc2b1c31893f2db93c8063
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mundori.com/js/ckfinder/userfiles/files/3847690158.pdf In PDF document text
    • https://clubelsendero.com/img_pag/file/vosadatewijofagobu.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/nutomifufurixagasubawir.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/vexininit.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/5750451630.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d45120a5f34d7ca640a3e494de0d91e4/1932383359.pdfIn PDF document text
    • https://akvaguru.hu/user/file/lulabuwimomalevinobe.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/70889960237.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/14892937642.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/filez.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c6012ecaa4728c05e65ef050c9aef4ce/72516929324.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/60747894481.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/fidinixewutir.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/kifamedida.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097849ea0e0b---mefabarumezol.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/14669950226.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/8u3ihl112laoro790pehgf5203/61165406991.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/dalitadenefugewit.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210602194203377.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ea2c7933---netubimilevatevabom.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f33eface4227783ed1b4c88f89682c22/pajoverasiwumulubodukibe.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/77459854ce78dcdb23eebd1cfb01848b/giwofafelabilezo.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/kagas.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/13513642606.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/538845941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=samsung+tv+service+menu+settingsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 10648 bytes
SHA-256: 9f6c6469d74a4cab3842d67fe7e73db87369de2ea12ef8f6339ffb4f8f97b55b
font_02_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 17148 bytes
SHA-256: becb1ee937b41a79e04a299fffc0c40e71a6686c73d5218dbed4b5cd1aeae41d