Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8d2dfe3afc61a0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 10:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b510498426d134750c24ddb6c32b8f36 SHA-1: 3099be36ee805f62c91e2c55a59a59355b04ea16 SHA-256: ed8d2dfe3afc61a0605343b3c012c1dc9cc1ccda8af1a1fa485e9b8acf22c9c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URI links and link farms further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=manual+dos+padrinhos PDF link annotation
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7473d0913c---pakofaxelifajavumu.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/38576415415.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/eb4915011fda27e538dbc47ba22c8579/xasavamezusunufefidif.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/74448050894.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120f0a257c23---jodemefe.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/nixeravaj.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/63292877077.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9d3ebf0b---76740763262.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/jetudafizedunurovilep.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/fifinojomabolebosobasa.pdfIn PDF document text
    • http://k1a.ru/images/files/file/72557559127.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a6a80355---ramuxefoxerivajax.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/33613297677.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b503e1a6---walisalixumutuviveriv.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/nusedefasuzalaso.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814c9fe3d7d---25792790886.pdfIn PDF document text
    • http://grabnerestriche.at/5697433615.pdfIn PDF document text
    • https://brod-plovdiv.com/images/zodawemekitud.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/883886d2955eff6a602cd9a2ce4f16e6/97389743989.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff53a493edb---11901122046.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/7nj8pdt8ukv2t11lhsq687fpg7/40864477359.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9f3e34af7ef6336a68056c809b191ed2/kejeruzugebaka.pdfIn PDF document text
    • https://cityface.cz/res/file/kunenesoduvev.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e17d2d5dc---mevudojofibidorut.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/madivazexibafukiti.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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 10352 bytes
SHA-256: 1239f0d85e1167071fcfcb273ffa572fef4476fe3002e0aa495830ee01614771
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 20800 bytes
SHA-256: c823f7a972410efcec89e042d725b88dbfe62f3c24d82dec35eb5697fd71894d
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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