Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbceaca8d35233f…

MALICIOUS

PDF

79.0 KB Created: 2021-08-22 01:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bddad98424da4fd4f98780bce5b9c1b8 SHA-1: 2bfbcecaf9ab84e1e86a84ee74828643a7e651a8 SHA-256: fdbceaca8d35233f4ff51a7ff5d0b8fa8913995fb6570301f3bfc962300567f0
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=cctv+installation+report+format+in+word PDF link annotation
    • http://aaz.sk/editor_uploads/files/77792613151.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/60429107561.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/21747910592.pdfIn PDF document text
    • https://khanikango.in/file/23958523559.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/3ja7ots74dpjrjkc7m81b2bq3f/durufuwunozameguv.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/mowaviwewegowemufojuve.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/67d7ab6627e86a4ee8af9ba953403d35/93626593827.pdfIn PDF document text
    • http://citranco.com/users/files/18288240190.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e18292995b4---56452347169.pdfIn PDF document text
    • http://honghuibio.com/d/files/sosonedotemewatudaxep.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/kasuzujarov.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cfdcb40e8---zozepakiji.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/31130151073.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/80962217188.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3af0bda9a9---39003849672.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4a91f3bb---xuloxekizedepetoxereluse.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/28935761637.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/pofofalufokixaxixosijivo.pdfIn PDF document text
    • https://basisnomor.com/contents//files/fokatudajumadalaxe.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/98804775811.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/jojawodenutemuzasafiwe.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p872nmeti7hm0ooc23i19hecg7/jolid.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/110ad294172297a1373e17fdef06f71d/dukoxibopakepo.pdfIn PDF document text
    • http://fittbike.hu/files/file/66536106731.pdfIn PDF document text
    • 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_off0000d343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD343 10964 bytes
SHA-256: 70c2e995b6da4f68e0e1d211daf25ad3080ac2cdef4e65efa3bff74a7586cea3
font_01_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 16224 bytes
SHA-256: b79b82ce8df1916f99864fe6eccdf45b80c557c50f538f7738fdd161687d5ac4
font_02_sfnt_off000116b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1