Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcff29a05c8881eb…

MALICIOUS

PDF

69.4 KB Created: 2021-09-23 18:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0c05d79281de2b3ec6a69f6f9f453f7b SHA-1: 3bface0c35bd6ef8f688deea66223d6d0b8d903b SHA-256: fcff29a05c8881eba5ce866cc1241de607d43921b724204b791e4650f260eec3
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the heuristics suggest it's part of a link farm strategy. No scripts were extracted, but the primary attack pattern appears to be directing users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 https://allytemp.ru/uplcv?utm_term=dnd+editable+character+sheet+pdf PDF link annotation
    • http://ateliergermain.net/sites/default/files/file/nimoganilivonon.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/56594591969.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/sunasefivepir.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/tefefa.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/4832554527.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/7259602493.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/xejerarifakeganadi.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/33639176131.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/bexipeduvalesidawusux.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/majogupedix.pdfIn PDF document text
    • http://svx.su/ffile/file/zotuxasodigoleruwoxo.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/60440363875.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6138cd542---jugowebexudexodobisa.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/bokaxuxetakurobopisuza.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/56569395659.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/60546367404.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/gomitujenavadosami.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161319b650b697---93638001684.pdfIn PDF document text
    • https://123natura.com/stockages/files/duzaxavewitijabuxedi.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/wufanap.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f826d23f---dagorunanex.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/28371085295.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/13314874786.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_off0000b1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EA 10736 bytes
SHA-256: f7584204bda21cee62f3ecec237df0a5dd3f14609a034fd6850eebb154c8ba2f
font_01_sfnt_off0000ca45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA45 14892 bytes
SHA-256: 7f5545c3e450f2c0c4cb6b7e817b64aadc297845c60e52e4b7be79742b8ef986
font_02_sfnt_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1