Malicious PDF — malware analysis report

Static analysis result for SHA-256 47bca461ab7e336e…

MALICIOUS

PDF

87.3 KB Created: 2021-09-20 04:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf15c69b3fea4788636da4a596d6a68a SHA-1: 0b81e455cf0dbbd56a1d1c18db825f87b2f32bf1 SHA-256: 47bca461ab7e336e093a776c92d6fd5718ee711f9fb90efd1bb58fc84f026906
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://chapraptti.org/userfiles/file/wusarajametopumowum.pdf In PDF document text
    • http://youzedu.com/ckimages/files/20210909201509834216.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390b43535b1---wizatamavedo.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/resimumomimutoxiveg.pdfIn PDF document text
    • http://feminella.ro/upload/fck/juzisupirasula.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134258ef219a---tiporukidupexupidolu.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://mousike.it/img_ins/files/57180076176.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/gikanegigupapumapoxo.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/25053719628.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/40042971264.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/59568545062.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147d3de56588---53638715805.pdfIn PDF document text
    • https://bczenekar.hu/files/file/bugopamigajedagakupawut.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/86994567246.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/1684209445.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/xelokojulaxosa.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/1051811883.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/firawa.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11523015845.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/pizijijuduvisixuko.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/41596116820.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/54369893819.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/sazanimegapotegojelijomiv.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/1779642706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+the+theme+of+phonePDF 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_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 19040 bytes
SHA-256: 541dadae0643b33285d88ab3a36cc45ae96cb5fef9d1d926153f26825c49a29e
font_01_sfnt_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 10596 bytes
SHA-256: 07728b7dc639a59193546058695d0aea132b24d2f36f842ab2d7b9d784153878
font_02_sfnt_off00013713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1