Malicious PDF — malware analysis report

Static analysis result for SHA-256 743490368e44629d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-10 17:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b6639fa3f8648a9b11bd9b4b992034d SHA-1: 41c5c9b59c51c0828e4135431a21d997c64bd06f SHA-256: 743490368e44629d9ce34f4accd531e15c1b929b62532dae4031b1556e63a234
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. The JavaScript action likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://ketchas.ru/uplcv?utm_term=why+should+i+switch+from+android+to+iphone PDF link annotation
    • http://reckdance.pl/userfiles/file/11420597655.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae5340b1ce---3749690443.pdfIn PDF document text
    • http://jonellchem.com/upload/files/36119473016.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/56733603091.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/duwiligebuzomabotu.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/36969459636.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/687cd46bd28ba2f743c88e895494fcb4/dakugun.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/zipeze.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c26983fac---bojinafu.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/95378237647.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/50416551347.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/76658962390.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/69511624064.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/8751625923.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/wutiguwosoremezatiw.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/dubapovora.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/8419603059.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/momuvata.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e5de773d3588d81927a3b627bf51244c/43808163691.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca0177f3a---21114994894.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/14335101828.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/vuvapotadusarozejobokinuz.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/40832947521.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/veloruti.pdfIn PDF document text
    • http://ecole.ru/text/images/file/sikomavefetamevekukam.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_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 17192 bytes
SHA-256: 6e571db4332d7f46098aeafe58be9d3a7909a64598ad00cafe4a6f25f8822ff8
font_01_sfnt_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 11176 bytes
SHA-256: 1b8cb763b6d72ada6aa87de650c9930de81f3cb88813dea4a10a7e9591a7c4bb