Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d892dd3423668cd…

MALICIOUS

PDF

103.3 KB Created: 2021-09-04 22:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91e4eb691f89a2492c0c21f510bd40c9 SHA-1: 946f41b84ff24548513782f50d70f64ae17c50c6 SHA-256: 9d892dd3423668cde396a15ad54f2750c8026fcf6b8c4a8e163cabf99b1bf6fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ikincielinmak.com/upload/ckfinder/files/duruxifuravizuneputotogeb.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/23911893905.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161238754a7dd1---91400410230.pdf
    • https://editionsitaliques.com/userfiles/file/pufujejituk.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/leditoveresulinafopun.pdf
    • https://menlopark.com/wysiwygfiles/file/97234160924.pdf
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/43576812392.pdf
    • https://allcreaturesinc.com/files/files/45850932201.pdf
    • https://bloomeng.com/uploads/pemediloxifo.pdf
    • http://ddgasul.com/userfiles/file/gopaveriturodovubow.pdf
    • http://bygreenpure.com/userfiles/file/75128296241.pdf
    • http://www.jindatunnel.com/up_files/file/99273198439.pdf
    • http://duythuc-bearing.vn/uploads/userfiles/file/zulifaruv.pdf
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/jepojavamujofew.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b4b07b24---54028779022.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/bixisamigepuxedetukexow.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a144b95185f639c76d0e8e88ca5f5fdf/movewiduzer.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=definition+of+internationalism+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7F 16792 bytes
font_01_sfnt_off00014391.bin
b28b87494b99715739f747a7905e6b3beee7be45be75f6359344cb6718f2aa73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14391 20060 bytes
font_02_sfnt_off0001778d.bin
64add1a48c85d68d826e847aaa186c6f15f83624bb9e871d06d401e1e4effa19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1778D 10660 bytes

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