Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfd87d6bade9c97…

MALICIOUS

PDF

93.3 KB Created: 2021-07-15 15:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3f7e0b8612dd39e831ce334b4dd6bf3c SHA-1: 6d209bbcdd39d0c1b0f0aff86c778f8fed882607 SHA-256: cdfd87d6bade9c9717549e91cb6201713ee0e1e204415b390a3fc3a1e1c926af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or link-farming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=jeremy+london+dazed+and+confused PDF link annotation
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9c82f6928b9ef4abe30ab9c03e63e7c0/65584977520.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/menilixapaguriguwog.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/075639d43a8808f898bc54d223defadf/dinepevotexizodi.pdfIn PDF document text
    • http://aps-mes.com/files/file/85726895689.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430231453185407.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/86224520513.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/nufejodosomujisipu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6a404b30a---xagunibawutinopigi.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/puban.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/rimesanolagoponimopanige.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/rameviradevosusutugid.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/bikaxitu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3bb7c6a0a70d44f4367aedaac39f32b8/34827584014.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/mofima.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b316dd9c6---pidebime.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/gopome.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/86233626749.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/26842194421.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/18859772d2264250874484edeb538fe5/37177066082.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a302e288f4f1fc45d2ddfa4688a2f3a1/77766977132.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/l321ep7nbi03f7jdhe3hksg3kg/dopuranopimewikugikegamov.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/06t4d15ckojno440q4m7rtttfk/vojagaketepebitil.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_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 17892 bytes
SHA-256: 14d580fbc27d231115bdf7d684bd34e24944f80afc2af05ebca7cc47d9b9e918
font_02_sfnt_off00014e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E11 10712 bytes
SHA-256: 54b8692545cf107e4cc602512cffdb70a058e2e6106f7171e6b51db0a72c9302

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