Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b269d24ab419e94…

MALICIOUS

PDF

76.6 KB Created: 2021-10-09 02:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 25f11e2fb948858206d44d9c8487c3bf SHA-1: f8d1bf2680b6fc73ce4fe1fe4762bb2aab8d6300 SHA-256: 9b269d24ab419e94f325632fefa4456dc101bef63d1f8c0653a7e6427b7a8027
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious or phishing content, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sailstudy.in/ckfinder/userfiles/files/lelewumejefadiwe.pdf In PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161304606e853d---47952064191.pdfIn PDF document text
    • http://korio-olsztyn.pl/userfiles/file/52074521550.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210920005634.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/wenosa.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/vowegevufodiriduranuzoz.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/buwiwalisituwamej.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2ccb26e5005e3666e72c7e2bd1e256ce/powatosaruxibes.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/80741027770.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/wadupuwawaxivazoze.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/ginozogukekukimubi.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/rupuxewog.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210906_073301.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6ffd48bd---78348580440.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/kexuzerunoregameb.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vaxiwebadoroxemekegazolo.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/16697564309.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/mawekomogi.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/28170054847.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/mojerejigevake.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/zimajikabuwadanepudidit.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/40462438650.pdfIn PDF document text
    • https://davaocarrental.com/images/file/15564867814.pdfIn PDF document text
    • https://luminex.pl/upload/file/25243233386.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/5289992769.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/2202946557.pdfIn PDF document text
    • http://sbkf.org/files/files/xamofejax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+page+setup+in+powerpointPDF 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_off0000c491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC491 10556 bytes
SHA-256: 9a8a5084369041b00c12b6927289672b9cf5962962534a86ef35d7be38e12cfb
font_01_sfnt_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 18080 bytes
SHA-256: 3f5ce9421616e9a5c119d17a74e0dce12dc3c35e9827f53cdaa5b3da0816824f

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