Malicious PDF — malware analysis report

Static analysis result for SHA-256 11628b5c18697a59…

MALICIOUS

PDF

85.9 KB Created: 2021-08-08 16:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76b60a4877b319a8a00c10b98841ce52 SHA-1: 8dc1cfcf7f07f83fc8c4882188762a5637f5accf SHA-256: 11628b5c18697a59f68c63dd30505c8fd7190c66b6a0e8f240b88580d53b0865
156 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc57c61fef---93549667216.pdf In PDF document text
    • https://onlinendttraining.net/files/guwunap.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tukanedumowefodenirezabem.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c53da7d88f6---xemabisetawe.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/99182518256.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/dc8f73cbb9a6054671186cf84b7ee1a2/1549963426.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/kejutidokiporu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdd7de5275---bokewumovewateme.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6ecb8faf876b66db90f40a6da1ac912d/tujawexogebufe.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813dc12978a---21680196765.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210626021622.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160996b24d6ed7---3453719256.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc6bbe1cf---nagefidefirujamanetalamix.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f295bc96ac---pixupitotuzivadesituso.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/43baed20cb9e86fb6f64fbb87643849b/93187462116.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079fbe302f9c---77061600644.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f689e810283---46712224351.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/47614090686.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/0gppjq75lt1adpogvro1i4k2ah/jevesisivubemumumuduxexu.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/593949553.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16109f4b59773f---dotesuzagaxusepima.pdfIn PDF document text
    • https://orrizon.ru/images/file/kogopujid.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/ranarepudoxi.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/87055790984.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b967f9a7d4---85615946323.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b917781d7a---51146626038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=carta+4d+planbeePDF 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_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 16328 bytes
SHA-256: f8bb231e7201eede0097b1d0cc2f392d066eaff7050d2dee8f5183a6475a964b
font_02_sfnt_off00013307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13307 10252 bytes
SHA-256: fe2ff560c34cd76e0c1f58864b64a4b45df0806b391bf892cffed7bf5e281bec

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