Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcd94d9ca583ebf…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 20:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e89d5c95fa99077a9cd9dd7e51c54603 SHA-1: 5a87a4ede8d3ade5c0362c35e911f59498eac6d5 SHA-256: 3fcd94d9ca583ebfc39c3200ce2c3229aa37365da76fc481db7e1c2a41d9c624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c555a1f7e---84408157462.pdf In PDF document text
    • http://lightofislamonair.org/uploads/files/55588503940.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/xerovuxoretunuvisabe.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/75687858844.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109171708116968.pdfIn PDF document text
    • http://yuli-china.ru/d/files/virijinimar.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/judavaputokoripujelexuw.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/jaxuxetokizovumojufizop.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/03ofh4kl2vd17me8oa63jjipu7/94489937426.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/66899420748.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/momezunido.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/68984155033.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090917314928265.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202196166537318.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/30323330437.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/nizoxoduperutojub.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/28620546065.pdfIn PDF document text
    • https://le27.fr/docs/file/68400606395.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/9361956422.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/4903347568.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe7670ba22---71234228366.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/widomebojo.pdfIn PDF document text
    • http://wwstationery.com/files/file/purutefejata.pdfIn PDF document text
    • https://dom-titan.rs/files/dasobopolazoduwara.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210901_2540800BA9E92B45.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021092413350965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=avatar+season+2+onlinePDF 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_off0000b415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 17744 bytes
SHA-256: 7e57f8969154633612d8ad5d6c03c482a07d2c92bc7488e842985d455950b504
font_02_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 10268 bytes
SHA-256: b48b5ac6b16f5138cd9be465af1693d785091cb8f4c0e31deec344dbefb728e0

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