Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f41d78478301cc6…

MALICIOUS

PDF

95.4 KB Created: 2021-07-16 11:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 09512e97b05d24072b3da94978dd7c13 SHA-1: e6b1dc56610b727a484d87276c94e2d75d70d7ba SHA-256: 3f41d78478301cc6fa720837cdda878185f2b1832c9d10b8eb3fec927cf6cfe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing or malware distribution campaign. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a3ef831da---kawepoxakekosorepuwejedud.pdf In PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/92ff83288073d17fc76c25110ce57307/5349056399.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c492e85029e---fabozuwenep.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160828c04561fc---4183536352.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/5fmn4d32a9k0kcmol7mn59suq5/titavole.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ffa77930---domomefaz.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4b188915b4957be145d7ec5894ae601c/nawubejod.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4597a11fd---jejorakopefewefofavor.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/nogevabag.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc770a90c59---gavove.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/5co5oo8rgjpirscpigv5buus43/zuxamenodukofewevu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a38979f12f---sonomomoxeliz.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/kobuxujesupalirovunemugu.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/29537754154.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/90361101488.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tettr0rq8fdhicv03top8larmp/redawomiwetopoxul.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d41bef94cfa---sizagizebe.pdfIn PDF document text
    • http://kccmaul.com/files/files/ginerebisazuwuvinazovoxa.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab99d2e39ce---makokenobejetozujipaginem.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/11045445661.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/niguselipakasala.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b231a15c098.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/xugojawibimuj.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/nebumalik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=i+love+inside+my+own+world+of+make+believePDF 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_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 10864 bytes
SHA-256: 65f6311d160e550f78e940d2a54a7bbaa2f4dc8346e47bd6f0e6fa73e59a354b
font_01_sfnt_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D22 19660 bytes
SHA-256: 9aba058938c8126b091123194ad4eae4893eebc3d299f6b61a9fd840468d24fa