Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ca9e75e540f596…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 03:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb5ad0c12a4985072043d77969a58787 SHA-1: d0553b765cfe7f2e902fa9c2a594c36c99204e34 SHA-256: d3ca9e75e540f596dfe70a7433f41306af652494e08f148944249e94502006e5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe7f33d3a---10534258839.pdf In PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/d4c01274da60dcc109b78ca97c0882f5/sesemotanamidimakulupo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608516a6b574d---meluwuwebonavud.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/1077193754.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1c62c0fc9f919a5a9cfe5a123a143326/puzajedoxavazuxarugamonu.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/48406499885.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/83429512737.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/suzoxer.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/13697124604.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/zudulifivedame.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/bokugiziwadaxenefegi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c370d36a---nukaliba.pdfIn PDF document text
    • http://ausafe.net/images/art/files/90656313009.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a3557e72c998c234602c8e61d8d8f8b9/21496813958.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/zugetifitox.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/xanupaxok.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161071f561eed4---75374420303.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a0089845727---62270586661.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/supavifu.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/78730289132.pdfIn PDF document text
    • https://5uempat.com/contents//files/88654184169.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/70253747399.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/35075166362.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca59ad3d58---71013390076.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/72658805088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cyst+and+pregnancyPDF 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_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 10576 bytes
SHA-256: adae7cf5e74ec7b27550072c378942991078a553bc141e3cfc11c5b324e1c121
font_01_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 17584 bytes
SHA-256: 72cfb838c0792fb52ab9e4186717104a91bb358211172fa2cbd6a5b6e4ddcb94
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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