Malicious PDF — malware analysis report

Static analysis result for SHA-256 de616a2dd520274b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 06:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1ed31cbb878f4b500cd55ef8f70aedf SHA-1: 097b3e1e3070e00ada4c54399ef8e5d35dd23e99 SHA-256: de616a2dd520274b61bccfd7339a55a2800112e9c77b6dd8be71bc70934c351c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nulifeus.com/~nulife/userfiles/file/jewajedegok.pdf In PDF document text
    • https://juhaszautovill.hu/userfiles/file/47182076169.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/sexezoredoxutupit.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/rukaxojidezunegoxekezida.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/stob6ps0nrgnuudad6khiuhog3/75741029205.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/rixovumimosozuwadu.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/17227680380.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/xemakutavelas.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/76903702954.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/65667144833.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/40320753669.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/fapepotijobawafuroxo.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/73429374611.pdfIn PDF document text
    • http://metallpress.ru/files/56816776141.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/67780364326.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/1f87fmuonub17vctrll7k1c9cl/lipalivukivexupit.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/34312510682.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/97388565550.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/bozozupixegituwaloveta.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/68506435679.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/74500d676723fdddf72b16fe37f408df/78406104635.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16130abc037448---mapixukukebutagutabis.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356c385c74a---86685229741.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/kokuvatorubo.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/mabav.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210911191928583122p0eig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+studio+xml+templatesPDF 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_off0000b29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29A 10736 bytes
SHA-256: 2578fe318fd5e38cfd3fb235ee1163de57b09111a153f55d06fb29c8dc887a47
font_01_sfnt_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 17136 bytes
SHA-256: 3a68570af686d2399a0ade7f2499cc7f399a2db08bc56b0762454b893300bf0b
font_02_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.