Malicious PDF — malware analysis report

Static analysis result for SHA-256 d419a185bcac281d…

MALICIOUS

PDF

79.8 KB Created: 2021-08-09 17:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff82e895928e99e94fd414c7c76784cc SHA-1: b1ae3dcc52564e58b67cb0fb9486a3804de19b00 SHA-256: d419a185bcac281d4c6e7b5994e3e22c41a34161824a134ed838bf93cdf8d168
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a link farm hosted on multiple compromised websites, designed to trick users into downloading further malicious content. The ML classifier strongly indicates malicious intent, and the presence of numerous links on disposable or compromised hosting further supports this. No scripts were extracted, but the overall structure points to a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/cb9672dae8900214383450844cb208f1/57247752063.pdf In PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/50706187718.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1928540f98e59754b884740e6514fb8c/88283588042.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d186cf54f---54764339556.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/16911195373.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae4793acf---tinatezepozanajapijipitim.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c3024a36---26550738003.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/65935545331.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/tmtvr5llliocsdvh6hrbkq86n7/3337019469.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/womumedal.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/cce37a15853303563fb9d0cdd82815c2/61889784769.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/53482057909.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/88740491431.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/lidavemobanutof.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/80488891295.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/zojasugapisobiv.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f147fd3b---beroso.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/desanabim.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/66640529176.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/91068466133.pdfIn PDF document text
    • https://datajournonepal.org/files/80884999775.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/fefiwalagowik.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/14050181274.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/43964173894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dailythanthi+today+news+paper+in+tamil+pdf+download+freePDF 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_off0000d1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CF 17032 bytes
SHA-256: 745f2cac49c078112cc940363f1e8e56a5c5129edbab9445189e763ca6146e96
font_01_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 10964 bytes
SHA-256: 954e768bd67bc40318734ce63ce0d754d6bbb85b740a1d86e7ae683d3d9721cc