Malicious PDF — malware analysis report

Static analysis result for SHA-256 962e9875bfed5b39…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 07:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6a71f81e389f4d14fb29c8414fe4436f SHA-1: 2791800a1275f0f305b900299890c2632b00a3f8 SHA-256: 962e9875bfed5b39e2cab0b859042c9558416da56b397bae8cbda57f150ca0b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/parusomoxalukab.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/qf68u6ocesgcnndi6bk6sthv44/navogokisodiwutib.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/goruruvenipijenape.pdfIn PDF document text
    • http://medica-brno.com/files/litot.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/roluzapukemekotemolomelo.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/niwagefapusigofurukekox.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/bejotusit.pdfIn PDF document text
    • http://topstec.com/d/files/77579840406.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/xepokuvexiri.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36baf27956---dibesotoruk.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///3059644304.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badba639ed1---91512742078.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/08fbed5c44869bb35c79a260a89d1640/35244809416.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071636a71ac9---ropukapetedujapuxesujubez.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/16474633292.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/50424826402.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076068416f68---luvofupugejenigo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/838af220602b77b5281f5c31f58ad0be/vejiwusewojeramutipuvi.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/31231442089.pdfIn PDF document text
    • https://orrizon.ru/images/file/58404319399.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098357bebc96---mukokek.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c1f81cbf145e9655c9ccd9669707d7ed/xuwaxutosoledusilug.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/15070344270.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/95117519175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=comparing+fractions+worksheet+for+grade+3PDF 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_off0000bbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE7 11400 bytes
SHA-256: 8cc18a46974968b97b93fbb98d247d65d7b6d2d003cfee26c6f81ed8e84bf40a
font_01_sfnt_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 16388 bytes
SHA-256: e867a15def36ff9d97e171a0fa45728623908bc769ed3eca5fc99488c6c8b959
font_02_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1