Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49dd817540ab3c8…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 12:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 96d0b3dde6ef83446c1ad00d830c5ef1 SHA-1: 9aec0495ba2261106fe8f51b3257139d5a9388dc SHA-256: c49dd817540ab3c8d4b072af93695d8361581f66661373d64a4d6b217f6088b7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as a phishing trojan. It 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 content. The file's structure and the nature of the URLs indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://ketphatthinh.vn/upload/files/tapojom.pdf In PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a8d79eea818e8a036de72ab7afe375dd/raxewu.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/8594281409.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614192ef3e6ce---lugutomufexukefo.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/27423534444.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/misaviwe.pdfIn PDF document text
    • http://compsult.net/userfiles/file/65082156262.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/49344402400.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/733a7bb71be5f8a22d735bb37003bc7e/doraguw.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/gitinegaxu.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/40771704047.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109070810268300.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450d7033fe4---dodajuvobatupij.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/13208654710.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/juwupixubupejupa.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161463e192ae0f---fijevi.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/29128639424.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/14475946448.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/dizimomunokakafadon.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/71721752899.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/lofipuvazide.pdfIn PDF document text
    • http://zgic.ru/!upload/files/sukopamerobeforovina.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/muratabenijaxulo.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/36209280503.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161355ca86fe60---zozavimifasan.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/zabonubugepa.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f40c5d509b---86946155419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=covet+fashion+diamond+hackPDF 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_off0000b616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB616 10784 bytes
SHA-256: 7d31fe04dc7d8f94a7ab98353bd8b8cac2a96a06907893ec8134b3a84e7bf15f
font_01_sfnt_off0000ced1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED1 17816 bytes
SHA-256: fe00d21b63df5ea94fa0ec097c4587a05fb707e8b9d265ad1645fa696000f9ec
font_02_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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