Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf448c37cc5b52f5…

MALICIOUS

PDF

82.2 KB Created: 2021-07-02 14:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f3a383f28f46a1682ea45689db9dff72 SHA-1: 08cc9c5da3e2be5f65934e53c965644f097cd166 SHA-256: bf448c37cc5b52f587e351958824490b616da5de9b7296635527d1d1f34188ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160decfeb5d880---94417211778.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8861d7feff---63656089994.pdfIn PDF document text
    • http://vtaky.sk/media/file/85256576343.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608742c5e0e24---61469829131.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/28326367853.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/57237888179.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/s7vo0gotp49ajbevt39u1k35s1/fusoxugibefikimokatil.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/julovokadoxukalojode.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502173156214408.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/76tods5du7f4j9b2hrka3a4s4m/99035096567.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/xebuwiv.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/05cd07a03ecc0623fd71af28bd93a064/85238050288.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f51f6e4feb---79998445943.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e4a753f8---34432996834.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d3aadca6d---31821254010.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/dekesuj.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/7103928511.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/qkk5s9dj0eqpre31np1j4bsrk1/fanebedisativadap.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/1rttk197201n0fo72c5orvih89/16999401259.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a287a818014759ac737bf7dc019a6cca/dojagat.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/vumujuxewazigal.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/26c09ce143665065a189dc39a934c27a/61973927378.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f781312d0f---7113697628.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdbfbd3a90---xirugenuzoxaluranim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=barbie+mariposa+and+the+butterfly+fairy+friendsPDF 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_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 19760 bytes
SHA-256: b9e1cb81d34053df2f0da2e1b8dbd6e1d39b6e9fe1b97eb0f77671275bc835aa
font_01_sfnt_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 11172 bytes
SHA-256: 6d6802fd027d7e0ffb03e3ee63e0451229cef0b22642df7bea1b685a3372aef3