Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f289a309c99c281…

MALICIOUS

PDF

88.8 KB Created: 2021-09-08 11:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ce490af8ee4daec343d7e080a0570e3 SHA-1: be4de95015f6bdc2da5070d6760ded0330bd4060 SHA-256: 8f289a309c99c281be6bb13989befee23fd45952617130c6ee13a75b07d815cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised or disposable hosting, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially to download further payloads or capture user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://inwebjor.ru/uplcv?utm_term=physical+examination+and+health+assessment+7th+edition+pdf+download PDF link annotation
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606edaeb68a8c---13805777434.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/lafejotugumaxoxoli.pdfIn PDF document text
    • https://marosme.ro/hirek/file/vovixivedes.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/rajiratoditupe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077323ce39f3---39990959751.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/34627776436.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pogigosexu.pdfIn PDF document text
    • http://cmtsport.com/pliki/26513151448.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffccfdaa25---71585535173.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/minuzutek.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109ac5a6e3d3---fupevebatatefetufi.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/62551448120.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/45543538368.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/43607607608.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/56608361016.pdfIn PDF document text
    • https://pecsikult.hu/files/file/moxazagimovi.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b65eaa741b200b06448d98db947a5470/87591866815.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/segoben.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/dsniiadps24424tmbeca9cber5/lepulofejiveronoge.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/83fd30e6163229bec7ab7f042b6f13af/fixolunilemudoliwukitope.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/begijuw.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/sikatufoze.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/7431325424.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 11136 bytes
SHA-256: b1860771788742928ed85e89d68622249cee81575ad083ba042ad902396bd0e9
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 18404 bytes
SHA-256: e0b360c7d02407eaa548816b52d72c9575414efda74d04d49d1613d1522c8afe
font_02_sfnt_off000121b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B7 17608 bytes
SHA-256: 6a0b0dcac04ada9d370a6bd03d3900094909b664c5f4115cf2f4625ea06f1e04
font_03_sfnt_off00013cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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