Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf76a07136d9d54…

MALICIOUS

PDF

95.3 KB Created: 2021-09-07 23:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fde8cd8fbcf2a439da16a3608648cf34 SHA-1: e30b4947c1f7ea9fab6c1d3d8aa1f09bb9d5c464 SHA-256: ebf76a07136d9d545b80a697893870621ce3e237b9332aec9f9c00c80bbada45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://szyqjsj.com/UploadFile/file/20210903192333595.pdf In PDF document text
    • http://iberia-ex.com/images/blog//file/69583219036.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/kabuvagexab.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/jonafarozifasadepuz.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c29sk40tgml64qplm8epju8gk0/3648660446.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/72823855898.pdfIn PDF document text
    • http://asustainable.com/global/file/696443735.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c6d5af33---gotuna.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab61d432d---70661184733.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/tewowisidanokunipuwesuteg.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c07c2676d38b71abef754a43cdca84a9/94917192256.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6v3e698mhmk0odjp1u81bmcmh5/34621737405.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/nuwanitokaru.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/56df39b48caed333ab83fcbfac2c2709/ruvurojasosuride.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/250350f615d3314508aed8488316cc04/91839864035.pdfIn PDF document text
    • http://fitviewer.biz/files/file/birisem.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/6230832619.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/19531265981.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ecc83fe01---sesaxomud.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15dc3c9cd---pelifotepemitox.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16090eec84e8c8---62405288377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=autumn+leaves+classical+guitar+notes+pdfPDF 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_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 11112 bytes
SHA-256: 68be5c9c684650dd0c5a9a461414fa2bbdb494766de3252eae68afe673419023
font_01_sfnt_off00012353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 19704 bytes
SHA-256: 9f736372022264b010580798416786e09137b8b12f520721a5f82749dbb9c1c9
font_02_sfnt_off00015797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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