Malicious PDF — malware analysis report

Static analysis result for SHA-256 f840a472571a94b7…

MALICIOUS

PDF

67.9 KB Created: 2021-09-17 20:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 086ef1633b838a0cabdad4efbbb06570 SHA-1: 604972b7608531c22bc20846e7e92123bcfd9ede SHA-256: f840a472571a94b771c883d2e8ef3b9ed9dede19d9c50b9a471ba064a41e5468
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6257

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.
  • 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
  • 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://crysiq.ru/uplcv?utm_term=friv+friv+games PDF link annotation
    • http://bfttacg.marketsearching.com/upload/files/wivezipunar.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/94765348664.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/wavadede.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/ruvufunotogejaxewipip.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/turolulawur.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9bd67902e---dorixu.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/raxewoxiwamorizonan.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/vigomimaxanizifatobuwe.pdfIn PDF document text
    • https://alutat.com/data/file/zotivuni.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090705263971.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/81490672442.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/76763439499.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/54532192430.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109090035413341.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/93307010346.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lod3r585u8t3bi1danbf6gb00c/nugujudilobusawaxuputofu.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/sofidolelosudi.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/52698183274.pdfIn PDF document text
    • http://muszempilla.com/files/file/zutozu.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/vezutojisokilitoxepuzo.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/23957139019.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/54332112843.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/sufibazagiw.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/h11ie2u9n7kbsqh1anho0frtv3/65281104148.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/pamaxedapupejesesofegu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 17160 bytes
SHA-256: 0f995af1c1d77530086296d527de06ced55af222a45ab948de6f9ead0b5a3b44
font_01_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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