Malicious PDF — malware analysis report

Static analysis result for SHA-256 b480be8f7c739ec6…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 16:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ffc3a2cc5003c3a8ef608f6e7e8e152 SHA-1: 0ab4795f4e7b8fb8de5abf8bccbc297950297bd5 SHA-256: b480be8f7c739ec670aa4e235204b8fa368a445969cd16762259ab54a88fbac8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=how+old+is+kirito PDF link annotation
    • https://opsclown.it/ckfinder/userfiles/files/gaperovinubelunuwoziwixo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b03bf2312---24549110155.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/17342089077.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/23500303645.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/91139924983.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/tidipalodipaluxefelaxeja.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/97083685763.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/nukajebafupiletotideviv.pdfIn PDF document text
    • https://projetovm.com/uploads/files/gigomiv.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/4b624961482b9ae97926afdc765b8680.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/5242080605.pdfIn PDF document text
    • http://chengzechem.com/upload/files/kefaguratilurirulunanol.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/80264864630.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/57016275435.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/80326482637.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/kawifilenidumani.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b47cf073bb---bakowufakabepasujow.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/panurimufiwakajuwajitu.pdfIn PDF document text
    • http://kftchem.com/upload/files/16449702676.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/vugexigerew.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/65058038832.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161413c1c78e3d---87546770765.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/sedowasivajigaxuzuvobi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/86515832661.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_off0000ccc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC1 18956 bytes
SHA-256: 91941c0d82ab46fe3e0736381c016ba386320b56c07babfccc4a9b6a78245368
font_01_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 10012 bytes
SHA-256: b1bd61d419c121192d0af543c535e6e6c8faf795e98adb195bde990cbaf1fa7d
font_02_sfnt_off00011432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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