Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f66c12317e2f0c…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 23:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54b78fc0725bf162de82cf84290c5655 SHA-1: 078a98df4ff6058cba9f2f02380845b67ddb8c6c SHA-256: 95f66c12317e2f0cba44c1f1e8f3aa14e4a9325d236373fe89adea97fead0fde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links hosted on compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these malicious URLs, serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://nenayu.com/filespath/files/20210918040028.pdf In PDF document text
    • http://ingmontagna.com/userfiles/files/josezapom.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/taputato.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/24583e1f90dc39f328a72c78c47d4244/deludolodisani.pdfIn PDF document text
    • http://dakmet.pl/upload/tafofabe.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/koluvupadodewa.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210919_3B95545F6B7360AF.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/pukibamin.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/sofagatezeridaf.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/takidufa.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/82013074319.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/66923727824.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9dc6216b---bejiwipumewulo.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/bunorupawozotelovo.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/46726033641.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/60836980249.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/xowexo.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/bonowapajovamikakim.pdfIn PDF document text
    • https://lorus.rs/files/83491259190.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/totasebariguzujib.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/68280439441.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138891f22725---galazadafizolubad.pdfIn PDF document text
    • https://kaimano.it/file/butipakigirewowezu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe22b18c3---7603611070.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/14455479390.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/98595087822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+apk+for+seriesPDF 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_off0000c956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 17236 bytes
SHA-256: 6d5048d9e4e71d862f841f9bd238fa6b78892c11bdd5a1bd69aaadd665d3689f
font_02_sfnt_off00010e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E38 10344 bytes
SHA-256: e3a289d5030e9dd486d11bd9c75e1918dd4bf19a28c4451a335964413c254f5e

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