Malicious PDF — malware analysis report

Static analysis result for SHA-256 0812426ea3695d05…

MALICIOUS

PDF

114.4 KB Created: 2021-06-10 15:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f12ff59a0507bf2b7029a2c4764a8e05 SHA-1: be82a89e1da36d33bb7ac8d7f24bbb4d9621702b SHA-256: 0812426ea3695d05db54f57b18ffa15fcd0b79e67445f30bc08544d9260d88ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other suspicious domains. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=spongia+tosta+materia+medica PDF link annotation
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/954163c9b0530c20ed0b9f0fcfac3961/63748549557.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/kaduteromepaguko.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3d2085e8cca37f198c508f255d8cee26/lalejagawidofumojaxapined.pdfIn PDF document text
    • https://chp-travel.ir/data/file/sopuju.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3ce5d4c0089e6b8696a3ffc080e74f65/60585701094.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/inph81ib499a4gjoctjdaiu6i9/tepiriromunodudepegisa.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2ad4dbe4---18863695855.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2f900e4a6dcd87dafe73fc22d05a020f/31842027694.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa55e8e128---xikoni.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/327c575c78b4d8bd0245ab5960caa46d/rilivegolozizovurubatatil.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/2770178284.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/3b80ss29623l20hqiuir8itadp/gugofomaj.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3jhfuhigtu91egnuv5cj9q7fh5/28090562208.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/57606996537.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609052d6023b3---loxulivusuxodafaxiriw.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82758b8f8---teladakowibilutoliv.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607662d86dbe8---lulixapaz.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc4c1f363---57489804975.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18379 5464 bytes
SHA-256: ea6016ee7e5791fa692f6265c5718aa7b98db0b74773b9fe3f21c3c3c76eda04
font_01_sfnt_off000195f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195F9 11656 bytes
SHA-256: 2d0ee83a28d2e21755d906cad2341ab2d9abcb0a2e9b282a872e81348c09cdbd