Malicious PDF — malware analysis report

Static analysis result for SHA-256 450baeb1872b5a96…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 12:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3690343b7d076a4ed21a22bf5aa498e2 SHA-1: 786c1668a9be21f6ee63bcf6b9cbd64a8557476e SHA-256: 450baeb1872b5a965d6e42af79cd48a1e297a1926a5ad75b5625182056d62e53
156 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable domains. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=fuchs+silkolene+pro+4+plus+10w50+pdf PDF link annotation
    • http://heldermusic.nl/ckfinder/userfiles/files/sijipusimagetog.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a5b404d84---kevis.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/17662092489.pdfIn PDF document text
    • https://capecoralliving.com/media/file/botuditadezirujimejodatu.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/12362163296.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9aeb7d7fd0---3122501657.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/tekixukagiva.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/63384068887.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/86666728019.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/rezuveda.pdfIn PDF document text
    • http://unsersohn.ch/images/file/bunutugejixede.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/vinitidotew.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4150b7e1a9bd96bbd94da43bd4419cc8/19863141044.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/vavesemunibaxutevidapuzi.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/zupixinoliguxukixabinu.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/6c7b7a23be81aed965fd3ff13743d9a3/nebelobejo.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/71397665402.pdfIn PDF document text
    • http://winso.tw/userfiles/file/xakalunopezikorusutegusu.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcd7261597---37530574109.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/rogutowuxuwawi.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/mesemujurigokodas.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/solunugewugeb.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838098805b2---54383793035.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/14684853771.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/14454681609.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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 22152 bytes
SHA-256: ca324f4ce910c5ddece775eaa97e353e8c5b9c1e0a49a88576f081f7f49376c3
font_02_sfnt_off00012a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 11100 bytes
SHA-256: 745636864ff0e6630a90e3d97c435bc6b57e94c52eb3a9580d081f0c429c8f71

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