Malicious PDF — malware analysis report

Static analysis result for SHA-256 7186b12c7dcf04cc…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 14:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8b1bec548eaa17787a132be5d3e8343 SHA-1: 4e23b5f8f40383ca4b5efa98a9a1c22bd6b020d7 SHA-256: 7186b12c7dcf04cc7c55eeb99f1c7d93ce0d9bf6abbab5e26e4a39ce0efff707
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Heuristics indicate it's part of a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3ehud9riinp3b9avgedibka5um/radosifokufinuloromaruxo.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c859bbd1589---zinunogime.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741efc5462f---97107098722.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/4g0hdjdam2hjj60ip1pjm90eto/35095150976.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89c74e36d1---92903662566.pdfIn PDF document text
    • https://superchills.com/userfiles/file/57706298855.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/mopilukorokubafomanatozem.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/84014799686.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8681394845332f73ebbdc95fdbe73270/sodupuviju.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/19705128323.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080c4da75809---36671213951.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/12250894937.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6a70e75a---mojuvus.pdfIn PDF document text
    • http://liyangah.com/Upload/file/73380622651.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/topigumojilufe.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf2ce15a9d---82579369308.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/gulujujerukiver.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/webojanavat.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/lj2te92gb069511ma3uc8hfo1u/15297748813.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/wugilaka.pdfIn PDF document text
    • http://teplospectr.ru/images/files/249927015.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/fbbcd695adb1e27c399d9859b5e264ff/kinumizeparujozo.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/478985e6558aecd803d768535d439d2c/japesegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=reasoning+pdf+in+teluguPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 21412 bytes
SHA-256: 20f0b9d6a931d8092f181ae83128921639e9446fb473db7edd2c9ad94339e69b
font_02_sfnt_off00010e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E53 16748 bytes
SHA-256: ba9309429f6e89713e4998f0399f93e446ef53068f45edb941ad5888dc8a7e0b
font_03_sfnt_off0001262e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262E 10720 bytes
SHA-256: dbfa4c88198ef71f4084bb0e97c82bb04a031256aada63ad23dbee8ea6f95659

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