Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6dd3f1c407091e…

MALICIOUS

PDF

81.4 KB Created: 2021-05-03 23:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9302f5c1a0e9d2d3a130fd2bcdf04d3b SHA-1: af015a5e5641a9ff3141aaae0be15531c59585ca SHA-256: ef6dd3f1c407091eff99fba588dd72f3fb9ed74239555cc040c73a7961c5cfa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload storage locations, suggesting an attempt to distribute malicious content or conduct phishing. The document body, though heavily obfuscated, contains references to 'Blogger template premium' and 'wkhtmltopdf', indicating a lure for users seeking templates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088070472284---317060902.pdf In PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/fef4be6ba8f06c2b55bd3f487baa9ca0/45409860511.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071f00db96ee---wojowumawuzekoj.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/p0foilbhpqfvkp91cmbj5p3a3k/12083078067.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847c9c8a2d6---93039232669.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc9ad0ae9---fivaperit.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/aabb39fa0df2a8551e99160776d66872/43857851675.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e7ba1325---64536690480.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/oe8ccagcmtp1vi4kpup6ime3in/wefaluxadanaj.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/ghgmnht2b2qrauh5h04ie32cl6/19534848633.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608716316a41d---92048178933.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/eakrgq4bf3fk6seu9cvrqm2q95/vitirasevevi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16073069028934---32612380316.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e62e87db---32570160547.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=blogger+template+premiumPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 3824 bytes
SHA-256: b14419ae379036caed627cd938b5997c54aca1e8abfe54d535085598df6cde1e
font_01_sfnt_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 5012 bytes
SHA-256: ed73e1088a66805cd38bc674cfcfdaa616ec408f3603b298343ebd117ef581fb
font_02_sfnt_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 15720 bytes
SHA-256: 999614d112473a8e7589876f5586f61cb9cc8b1dc50f8015453ceb338b14797c
font_03_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 16396 bytes
SHA-256: 22a2e475d40f5270fe835ef6a628bacfc5f554775bf13f863f8ef6ee53f3c125

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