Malicious PDF — malware analysis report

Static analysis result for SHA-256 763fefc551467164…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 16:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 32d41f4a469231ddba2850d608dee864 SHA-1: 43dc1b94e8b2806b9b95451fd73be4beb6fe3745 SHA-256: 763fefc5514671647f8df1d40677630ed8c2b92d4bae69a2accf194981f91154
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/99eb03a8336d8ee5d447501ae0222013/77792089399.pdf In PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/24878981105.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/sobisa.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f48a036f8---90198568786.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/varosomuzabunubefa.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zifos.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/ddd69023a0a0a8ba91aee214ac49b34a/vuwiwizedopetubebek.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c49ce806eb---vuvasekularawajujozefuwit.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bac3650635---fojazuxozipikidag.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4fad42fe25602b9b698d53a9e29f3d48/8707246875.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0947ade562---bijuruvibixexe.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1dcq7li3r0n3oajl5o7s4ksqj5/junup.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/39668149983.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/98531943871.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/51779146634.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2df4eb240---wasimamamomotak.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/73989205732.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0bdeed618---67621570044.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/tl6aiud53e5kjclp0n3ue1r9j6/65612150963.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/zazadaresiwararilavakujis.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/folominotifew.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/df9d5db3243ee08503940286fc2a4e6e/99459589949.pdfIn PDF document text
    • https://energooptima.hu/upload/File/10505422506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vitamin+c+flushing+of+the+facePDF 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_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 10752 bytes
SHA-256: b5e3257d3c8499727de6790726710df08bc14c6da8f0af64b2e29991c08e51f1
font_02_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 17260 bytes
SHA-256: ef154f09d0536c8e2c45064adfdd1d5f6af2418938bf9944eae68c7dffaf0a3f

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