Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b9be80abb5a2f0…

MALICIOUS

PDF

98.3 KB Created: 2021-06-29 05:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7fae8f7ae6267bc5f7c4033ab71c1279 SHA-1: 2e8f1407071018bb6180aa9c9f6b7fc7a383eed2 SHA-256: e9b9be80abb5a2f056b78a1376babd512598c70d4132d93b143756499ecf2628
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://shtaket46.ru/page_edit/_samples/userfiles/files/jupulanitilotanadisifafov.pdf In PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160956aa64b1e8---75036659584.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cee537a6627---numijapobedivamenusa.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/14633373049.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/36727043161.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0e835968d61b60f26dc3ba345de91397/72602138915.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/sobilivazarojikinamiloj.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210522045638828437914.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/q2mf9unecm4bq060lbidpoar13/wevisas.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/2rk7k11ue479j5bb32506umesh/51518126848.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27aa7e52b9---10806319822.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8sj8q9olbo5av1g11r1k5uo030/noposipizuturezumodujud.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/mannbhft3dmq1vdghjd2vsmi55/97051748155.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/55954536830.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c4c25a5e---xujazawafozij.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc5ea681e1---676398989.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5c7da8844d25840a486bd6a67b43971a/33986264267.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/selemadomisut.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6a392d879c681335f6239f0b382e72eb/vubamit.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/62b2a9687833854ced44432cddcc9c9f/vabisoposoraziwofilupal.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a41a4bea2d20a27a721153e07bfa2daf/96234300800.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/94065484061.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1b6c1ac7---midag.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e8035f4f---87417902356.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/755e5009953886761acb29d5c9a6c343/buvivuxabakaxikexidod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ecoatm+promo+code+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/25760608077.pdfIn PDF document text
    • 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_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 17600 bytes
SHA-256: 6552daf25fd99287d24eccc415f25fbf0c938c663136b8e27a4c10ace7a40e0d
font_01_sfnt_off00014c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16475 10444 bytes
SHA-256: 0db2b0efa2d6a3327ad4898af7a13148d10841a53809bc99de15ce1c8895e738

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