Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86215539ffb290b…

MALICIOUS

PDF

98.1 KB Created: 2021-06-25 13:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 485c6ffa5f5875a8bfdddcf7f6221de8 SHA-1: ee1af9e1a185be52061dd693a6b09d892bc87b58 SHA-256: d86215539ffb290b6a40d70864c556cce2e1eb5326f95c710aeec827de50fef1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites and are structured as a link farm. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm on disposable hosting. While no scripts were directly extracted, the nature of the embedded links suggests a potential for redirecting users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6b34d3dc606e754c076a1d0a6c7f02d6/84655453888.pdf In PDF document text
    • https://sasalidayanisma.org/uploads/file/98448272266.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6baee457c---61442780994.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/nefofokuzuxofor.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/75212920933.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/08b8b1d751d9aa1c99c125679508ce73/29899570079.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3a3a3fd153e5baf09b6f6d54b5c66585/96696620620.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c393cd02819---2434220967.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/danerulibugobufaxifavoj.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876fb8cdcd3---likavolodetepodeb.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b03caa0fb5d---15045051411.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d38233c5a---41098221083.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/xeruxizunive.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbf5456911---jaziperodojuvet.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/nsjnv7jqkpfqa9p82q80ipe8k9/30818414697.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/4ca53fd041f8738bb1f1a82a390c2778/gutafetokudisuvesewovidod.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bdbe9563b---biropujiwevoxafejup.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/i37hq72vkdbcugr5lmnnm5pug6/sumoboledevalojikifujafuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=itunes+trailers+usPDF 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_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 17536 bytes
SHA-256: dba0a6732bc6a46cd5b9234c77ee337343bde821d1da34d8f285c2dc8905a88c
font_01_sfnt_off00014bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC9 10032 bytes
SHA-256: 3ec164d72b360cc8f53f9a3b2a684341245f2521be94eefc1c427f2f712e736e
font_02_sfnt_off00016233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1