Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbaef6dcfb495e2…

MALICIOUS

PDF

87.9 KB Created: 2021-09-04 07:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 49c32078b0e0fef26ecc9e8a89003973 SHA-1: 0acc8ef60117fcc920e5c5524d88bbba443cc1a9 SHA-256: 2dbaef6dcfb495e28d99e0d8d5cc9058f2593a8fb7bc4a082e38bbcde2d772e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files hosted on compromised CMS uploads or disposable domains, indicative of a link farm. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://deshpanday.com/ckfinder/userfiles/files/kizetuxegi.pdf In PDF document text
    • http://mathcountsoutreach.org/userfiles/file/21847234537.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/74658162610.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bded18e4f---boxedik.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/75077958226.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/fozelotiduxe.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0f5d84e26584b1a019edea4440425896/kaxidutolatikinav.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/18973763692.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ijl27m6cdk2oqng4bnkum3ovf3/wenorumirubir.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/70658987634.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/pofisagogosizoxikanud.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021060912182779.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210710_091102.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/afd97afc0c8c5fbccc7da70e330b2e33/kumonijawefupuvivedavovin.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/mewasaledaziliwun.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/magefenuz.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99897169926.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70643537358.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6b04e1d5fed3640b8144052e4a816ed2/nadiwewunivifipovow.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/pejibupixizan.pdfIn PDF document text
    • http://yejida.com/userfiles/file/97793374077.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d3f6858983a3ba7be98a52ae08fe7f5f/30962217152.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f58c186727d0d0e7ab3c357c5c4006f0/jegurejuluzigonuzali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=turbojet+engine+design+pdfPDF 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_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 10796 bytes
SHA-256: f9744bedc114bcd97e32d97e4b7390199500f3b7c0d5b749a8b1935773aee54a
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 16640 bytes
SHA-256: fb4a687479015728bf2cb0290d05d7db8265099f63059c97183e8d7762903629

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