Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa5a560d1bd9a1d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 04:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3588905acab0757b616f210e03c8895 SHA-1: ef75f664a9bf6d0b9902cb7b63c46a964edcbc45 SHA-256: 2aa5a560d1bd9a1d5ea7b8f858029c1a3885fa4577e089d2c3910788ce1d83a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or conducting phishing attacks. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7f752b3493466c025726c90784d8e53c/nawadabax.pdf In PDF document text
    • http://kistours.hu/userfiles/file/29575282984.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/54105b4bd6ed37d57c58055ae0a4bc9e/wufasi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9c517be8---jevamugixakikenidozivire.pdfIn PDF document text
    • http://change-sexy.com/files/files/xubufipili.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/nakamezowifipezegizavemar.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe327cba0e---melule.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c383c1a37a2b5eb6412fd7fe1fec1485/78198441919.pdfIn PDF document text
    • https://digireg.nu/upload/66047836979.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19c736ca2c---favadefikum.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/10799251808.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731d41ce281.pdfIn PDF document text
    • http://whatdwellswithin.com/file/jumedowopu.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/69227744372.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/talemozegi.pdfIn PDF document text
    • http://nanopena.cz/upload/file/dexijasexa.pdfIn PDF document text
    • http://vejwun.cz/images/toxovu.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/ca07018e55298be9217b040344e5badd/muwuxepakelelidovi.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/51086333290.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/b522a7af73a8181f462433e0c5e64c54/38087995993.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/29026628409.pdfIn PDF document text
    • https://mfdesign.hu/files/file/67324639314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=luxembourg+city+bus+map+pdfPDF 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_off0000cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB8 11228 bytes
SHA-256: ffac270a803467986efd0ecd2b0b72793a6b22170ca10e9da5aca7c327527c4f
font_01_sfnt_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 18548 bytes
SHA-256: d942ee9d4a622b4fb88371cf3b7c256595b13d9da689b069ace75154fdccf2c5
font_02_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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