Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b75284df1e345cd…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 18:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 6ece67a3527727185648bf7487af9a37 SHA-1: 78f582064f8ce5414e2ed94deac56d379edf37e4 SHA-256: 3b75284df1e345cd3898270fd96da328ffcf1bfb3aba6d2da23bea56250e413a
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript which is a common technique for malicious PDFs to execute actions. Heuristics indicate this JavaScript is likely used to redirect users to external URLs hosted on compromised websites, as evidenced by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' firings. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7739

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.
  • 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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3tgf9qrp2iskudlq9vthevpoud/sifujizusegifab.pdf In PDF document text
    • http://ndt-ultratech.com/files/41004890523.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/jafebamorikejuxati.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/89969442506.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb9d5c273---46883150563.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/tijimaviboguforutuzaluwa.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354722512e---nomujisedovotib.pdfIn PDF document text
    • http://tochuchoinghi.org/files/84774853097.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/batixuzugekekib.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/24267894552.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/zerokegu.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/27539576916.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/39483953892.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/11822800526.pdfIn PDF document text
    • http://halmar.info/userfiles/file/17824825396.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/56129427895.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/wugabusirexikozenazuzuja.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/xomuloliwel.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/87746910627.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/93607135582.pdfIn PDF document text
    • https://shibbirs.com/media/files/47914822270.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/48921212944.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1aef24f2cfa66e1e589f610304e46425/75340222219.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/xodape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=old+friv+2017PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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