Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4d0381de1dc360…

MALICIOUS

PDF

88.6 KB Created: 2021-07-22 22:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 27b1b031bd1d60eabf00161942e44ba8 SHA-1: 44054c54d6dac18b1a12ca42fecbe1c8d3a63431 SHA-256: 6a4d0381de1dc3605381f703f3bcd7f5bf545cc7f4f831502c826fec6c7bb380
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3af1bb408---24002892833.pdf In PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c06ba1a9d40---78633616523.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/5da220ada8fc1634617078ec94128b1b/9179501151.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/satenivasexupujofosigu.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/vupizuj.pdfIn PDF document text
    • https://isosklo.cz./uploads/gumape.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///tagexusavena.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eef8f91e00---74747403345.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/tenawizekenodufunisejugom.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/gugipit.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/972df3c98ab8c7c1d702e1b1fa6ef3dc/givabaxabiwukuz.pdfIn PDF document text
    • http://polletnv.be/uploads/files/48777700646.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/efa2231603e00b423126ee6047baae85/20941095311.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afeda005b6---nelananezejukatetodo.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/85342553416.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/61264060027.pdfIn PDF document text
    • http://wohingltd.com/userfiles/49030144880.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d038ca6af00f041fc77231b462db1ad8/gomuxotevevizisorodadot.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a3986ac7---rivoxubuxidod.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e5f6d18c21fcc51a034c620fc52a4827/30870627800.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/losotigukelipadaruzorej.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a565f49e---duxanigoduk.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/gokiwalobe.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/39447048105.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210702_0CD7FA4E612D18B5.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/vikexepof.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/10879022074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=another+word+for+deceptionPDF 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_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 17384 bytes
SHA-256: d76036f73e2cea4e4e356726d2c6670457a1d32ce329eb4ff12258bdd424d3b8
font_02_sfnt_off00013c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C68 10408 bytes
SHA-256: f158e254e07e1420a75ca408f313a6dbe5ec9d539e173c2bda63457f76b41e66