Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d528c0a2cb0e21…

MALICIOUS

PDF

97.1 KB Created: 2021-07-01 21:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a9307c870128b3da67584d80b18f1f8e SHA-1: 854d048eec3578c32bcdc818cbb75b7db75cbb0a SHA-256: 15d528c0a2cb0e21e21b2f5e32e9a43e12c823c711882c84f5ecbecee442ff56
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=inflorescence+of+cotton PDF link annotation
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e6bb331b25b325de6480fa20ac2548cb/bewexaje.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/vevavadidasesubi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b804ff46f0aeccdb0e114e3978c16c20/73184562777.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80eb67fd3---jufidiwibo.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ea83b451---zoverel.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/sunuragizo.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/bexugoworozodanuso.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4d066f7d---pakesonefukarilitojegox.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/51261307026.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf0af4a7f9---22726949423.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/6382880797.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/kawolazafi.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608573cbb45a2---75166525321.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a73b50641d8171d32361fcfeb1b04201/visinojanelanovije.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/3taigqp2o71kficsc3ps9do369/minebesumologajesegozo.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/mamux.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/51616186061.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827f50c838b---renotaxakokikujobef.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210603203122.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/soboxovawodepejalunogiv.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/hu2korat8s18f9aip5u3rrf8l0/gowiwupejox.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160980b89d639e---96343652064.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/togeruderatadirapixafo.pdfIn PDF document text
    • 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_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 10028 bytes
SHA-256: b535946b8acf3f44b99b33f5aba1f019ca2aef694a8f85dbf6821f418ccd1408
font_01_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 18116 bytes
SHA-256: af4d93118f42d4a8a166596e72d4e0673870bcb39d0806047107ab4340bf2700
font_02_sfnt_off00015dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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