Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a93171fd6c9454f…

MALICIOUS

PDF

62.3 KB Created: 2021-09-25 03:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16d349f3250f425eb35025fb386e9689 SHA-1: 22adfc291e4c8b6e2ad113ab0850d47567da358e SHA-256: 3a93171fd6c9454fd1d2938f8ed3a0f2a31ec61db48d540ba7e41186e1ad219d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8970

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://catamma.ru/uplcv?utm_term=how+to+watch+fast+and+furious+9+online PDF link annotation
    • https://flims.atelierleuthold.ch/userfiles/files/moxugagekime.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/soboz.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/dojonekapoboxexisesupawi.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/26743024167.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/jexisozapavo.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/56858714883.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/40654373242.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/56537123662.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/winemuxurovip.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3697aa6f---77282549084.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161458ec9be2b0---gitawujojete.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/tukebevududatori.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/9002994378.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/kidaporakelugoxosonoge.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/80611553560.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/febaxariwijokugekozul.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4f923ef2---wumuma.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/65229006757.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/tunazojon.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/xezunekifabajigumozejor.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dde45034ad---xixesimaruvudividikorumos.pdfIn PDF document text
    • 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_off0000bf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF65 18160 bytes
SHA-256: 4c4398f6b5c02a6ab97eaf5aa4768ee65e5b5f533f154639d18b73f5a71bfcad

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