Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf9c32c92ffea9d…

MALICIOUS

PDF

89.2 KB Created: 2021-09-06 09:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01992ad67f84bcd3323ab8232a7ba648 SHA-1: 6b0b709c9e0a9d2a97b09abcc651fd00d4f61051 SHA-256: edf9c32c92ffea9d8ea60bc254ac572d49b7d3fd5e3c36a51249a69ff0800700
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. These findings suggest the document is part of a link farm, likely used for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/4m2cse75avg8ok534hi6a4mp57/46555114686.pdf In PDF document text
    • http://hyunshin.net/userfiles/file/69562994775.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/m9bg6u91po7c2ieqsog16vdjet/34441779881.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/bazinovu.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/vukugosozugodida.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6968526fa73ee7ffc31239f181a0377d/nubixarofedibukibuneto.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/rarumipo.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/jegudewuri.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/36232967219.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/97154736066.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/45884421589.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/27864498116.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/67187422046.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d611a295---dujajusiwumoja.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e4828ab5---12281269293.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/16326812807.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae75d03ee7e---losidevanoxewedawuj.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/teradi.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/poditaxefinesodegekazare.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/82d309e7193685bbc3a45f61f609c169/20516897359.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///77435653609.pdfIn PDF document text
    • http://palami.by/images/file/66803156926.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/tedaviremajogukujina.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/29487072842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=thermal+energy+heat+and+temperature+worksheetsPDF 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_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 18644 bytes
SHA-256: 1495e09d2a4e293bae63a8e51d83b67373af7574b2c49d03d7b18d5dcccb5aee
font_01_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D55 11104 bytes
SHA-256: 0391fa329946384cb362f616e89a9803aaf8505b5e441fb60955ca8c9afd42a8

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