Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d3523250340126…

MALICIOUS

PDF

92.1 KB Created: 2021-06-25 15:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51592c8d2e15a368724850b25bda1898 SHA-1: d05d59e623a8d92c44f076412ce97fd675b8b2d3 SHA-256: 56d3523250340126b7cfdf3d5578069f7aec022464a68430aa7fae6b2f486b34
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f0ddd447a---xuweziwan.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074b4f27da8b---4029646699.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf07cabb5---22152879159.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab04a4bdca---69503665872.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6b854c5385332c20f261fee6c6b694fc/posoda.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/b53b5a96997176e22b847a0cd344cc5e/zusotarerodirij.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c694e25f5---fapuwebakixif.pdf
    • http://fedoro.ru/upload/file/40572371884.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1a1e3427f7945c3da2acd128b9c6571d/19278673689.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/r545uph3irql6f0gmg0q3ss795/vovosaz.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21fa67a450c02054abf1e3290dc4ff3f/84960414796.pdf
    • http://laduses.nl/image/file/31271346667.pdf
    • http://przedszkolenisko.pl/userfiles/file/55955819967.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed8543fd18---fofaxovamunotawina.pdf
    • https://actor-conseil.com/files/file/sakoku.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081a5fae0b01---nusiwamodikafonasebog.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba991d6dd---75682362350.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+dare+project+123movies
    • 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_off0000ffdc.bin
10a92c9aca3cd070296234ea7bf5fe9334dc0d85b1600825e9d02c777d844766
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 19124 bytes
font_01_sfnt_off00013193.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13193 16792 bytes
font_02_sfnt_off000149aa.bin
0e6de06cb2a35a831c24fc0169983c4087b40c429a09db672ae49db6b0e1df3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x149AA 11132 bytes