Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8c7bd577724851…

MALICIOUS

PDF

84.1 KB Created: 2021-08-18 20:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b1c54056902ff0a3e8c4bcbba85c2c7 SHA-1: 9dba2e1e4ea8d8094f5ad98b86003b7afeeb9ae6 SHA-256: de8c7bd577724851b4d2cafcadd9cc0f831f21082420b4768424c7859b3c6b0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to trick users into navigating to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://busankid.com/webfiles/board/file///21983542896.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608943a887105---85655533857.pdf
    • http://yongchengtech.com/uploads//files/202108042135244850.pdf
    • http://akcjonariusz.com/UserFiles/file/61363863342.pdf
    • http://zimaletto.com/uploads/file/kolewuvanavipegojobag.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/27de9fd91fb52620e9124c459388f706/12268569682.pdf
    • http://cukrarnakolbaba.eu/obrazky/files/wurudoruxomid.pdf
    • http://lafenicealcamo.it/userfiles/files/22852770951.pdf
    • http://sportsclinicwest.ie/media/contents/file/fikotedimiwubo.pdf
    • https://solelane.com/ckfinder/userfiles/files/17024789536.pdf
    • https://amblamy.ee/upload/file/xegisozusetopefetexonofat.pdf
    • http://petukmahaaaraj.com/userfiles/file/89761660423.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de977ddd52---kinasaluduruzebaru.pdf
    • http://whewfamily.com/clients/12004/File/50523481970.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1468b038f4---livomototukive.pdf
    • http://cy2hand.com/userfiles/15646347125.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/0a77885c9ae3b812b69f4bd0a5b33b19/nonekuven.pdf
    • https://bocion.com/ckfinder/userfiles/files/wufasoxuvupirunoj.pdf
    • http://sicompk.com/survey/userfiles/files/nusirepubisugutigedif.pdf
    • http://poiskvod.ru/images/file/kodoxususagelonipetalexo.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca7d58a26---1831162888.pdf
    • http://goozzl.com/userfiles/files/26417304182.pdf
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/fikixokipogunujifab.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f06d6f388---48027285647.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=defensive+driving+course+nj+final+exam+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e347.bin
f2824a4d6ed6d21f41c530cedbe3683dda9a2fbcff3316581efe6bd08958bcf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 16888 bytes
font_01_sfnt_off00010f55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 16792 bytes
font_02_sfnt_off0001276c.bin
7dbcd8087723e3618132bc56486af88f037bcde19c590d3cdaa929a64fed81f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 11204 bytes