Malicious PDF — malware analysis report

Static analysis result for SHA-256 f861261cf770bf9b…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 04:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c1dcc318bcb92dad4c4c8616c6528d7 SHA-1: d7cac22ab21c3c0e4807c03fda6c5e67cb11d24a SHA-256: f861261cf770bf9be614f6612264a0130ba24657a021139b126820e2171e1190
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute malicious files via these links. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/22ef3f7e0192a254e4221345dd8459fa/80492594425.pdf In PDF document text
    • https://securitydm.com/slicice/file/ledejesarixijamokabu.pdfIn PDF document text
    • http://tochuchoinghi.org/files/jurerebosewokudizoku.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/62258124353.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cc92ddf95---gitulupobogoroxewaxe.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d366e690a9---11553434719.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/98734346302.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/mutijuwefazesosumapajor.pdfIn PDF document text
    • http://bjallstar.com/upload/file/neruradaxepupi.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/giwuzipeguwaxatusaso.pdfIn PDF document text
    • https://carlojans.com/cms/file/50135564657.pdfIn PDF document text
    • http://stasta.com/userfiles/file/kufokunade.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091746f26e1b---7449063815.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/60505380777.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16126affabff73---duzamulotoxubefeganeg.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/30a5f284286902a89e0f3939c1d2d9d6/lomawovapakife.pdfIn PDF document text
    • http://teplospectr.ru/images/files/tidazixikelibozo.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/fidataxaxubas.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3f032145d---zifumifem.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e826537c8f902662c588f9661b0fe7b7/pegafuxejejixiwinutavej.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/94588650393.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/23038316452.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/33957946864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=neural+network+adalah+pdfPDF 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_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 10588 bytes
SHA-256: 9cd6639370a0d09d2fbee4169e78c6caa3802df0f6663f8949142264b2884dcc
font_01_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 18116 bytes
SHA-256: e6a9197694d698d0e00241dd04f4aa104184087d80bb5672a41716be41c1f3b7
font_02_sfnt_off000132c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1