Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd405c9c14751770…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 00:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6b36cec083e5764118280e31ff7f30d0 SHA-1: 0366cde070d21bab4f4b674291884311ae75fb9e SHA-256: bd405c9c14751770d6f5fe4a6f2b83abeda0593aa6d2344fbb4c2c620c57c579
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crcnueva.naturasoftware.com/uploads/images/files/72792503002.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16153846ec12dd---73116754320.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/titiborivaleso.pdfIn PDF document text
    • https://mikludava.lt/images/files/ruriborifir.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/877314060.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/85601851837.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/zarila.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/wironajujemobi.pdfIn PDF document text
    • http://agrion.org/upload/fichier/30761475980.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/37331162843.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/893b45ea6bb1044c4242f0440e7601c4/3870569384.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/tuvotepidajudiforegomuw.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/bisidodefebomoniriwog.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/bijawoluzesida.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/11843013077.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141394a64080---37312351343.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/nebuvunigigolu.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/wuret.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e91033a1f0---xenebemavubevejalem.pdfIn PDF document text
    • http://atomleasing.ru/media/File/89026985982.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/52729765569.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/8385611236.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/66936195625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=best+multiplayer+survival+games+androidPDF 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_off0000af4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4A 16152 bytes
SHA-256: 7225bb16fb58a84a814c9d6e7bbd923953e722786f8cd22ce7ee6352ad547eb6
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 11068 bytes
SHA-256: 9215b3136401bd57b8b30732c3fc05d48ba83d7674137bc7f012e1bf85780232