Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3782b8a69152aaf…

MALICIOUS

PDF

89.6 KB Created: 2021-06-08 20:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6464db49719915c440bdf80a0bf641ef SHA-1: 0499ec05a0e1354dd79307807b2220de21385cda SHA-256: f3782b8a69152aafd2671022e889c83f29c16d9f077c48d8a8cb0d05eb29cebd
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although 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 0.9997

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://inwebjor.ru/uplcv?utm_term=canale+tv+romania+gratis PDF link annotation
    • https://powermailer.in/userfiles/file/kusipudurobusuget.pdfIn PDF document text
    • http://citra.cl/userfiles/file/3804940744.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/2219573882.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ca0f044454f3c855b79ce7217339e0f8/fizajuvazerotit.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/00305667d62c0a068da7f4e2a9dcc4e8/suzojexuxoxomatolivi.pdfIn PDF document text
    • https://unosms.us/userfiles/file/99803899079.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/82076308722.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83263e4e67---98671781211.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160babbfc175c7---gawuwunaxuvus.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af77e3dd721---93583298972.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/941d7c3b40e70e3afcfa59f01e71dd56/9829823003.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a33c34263---filagiduxumijubebokotizox.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6d2e8e2c05c63c003058888af4c1cdb5/68656764440.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/385abaffbfd5669152ce1f348b1b2b3d/12290217263.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a6a7a9a1dd89d46ff079d3995c5e0cb0/bizerulijidoxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11290 4876 bytes
SHA-256: e38e6640ef48d3d578b1b2b7beb2edebc5f2488848057af0220e18a2cd5a5e4b
font_01_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 12740 bytes
SHA-256: 1c4347596dcf83ad1a2e0bfad26e4559eb8c7e0b1166d40f32b3ada847a0c353
font_02_sfnt_off00014b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34