Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf4f0d1ae38a643…

MALICIOUS

PDF

63.7 KB Created: 2021-09-18 22:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc70e58e4a061314d2f08e9b6d56417f SHA-1: c2a74073be6f1316aa28f04836a01ff50be1facd SHA-256: 9cf4f0d1ae38a6437731908f4800a90f3dfbaa219dde930706f416b182ce7d27
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. The presence of JavaScript indicates potential for malicious code execution within the PDF.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4442

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=breathe+madhavan+full+movie+watch+online PDF link annotation
    • http://hvezda-pardubice.cz/files/file/sejiduzomipiwediju.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/semuk.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/wuxezaminaxisazanegisoro.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/nukipegoletusere.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///39070527469.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/karopefurujanirexaf.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/89906448842.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/eb9fbd737a2126eef51a0121c2e86250/kugogilodilep.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/nipotewelabega.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/96715842228.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/187d5ae4a0eb0d56301fee89d9916863/89444231858.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/74465787667.pdfIn PDF document text
    • https://12waktu.com/contents/files/37294251910.pdfIn PDF document text
    • http://sparkpro.lv/content/file/bomijazemavagegelodiborug.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/37486727676.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/bidorozogosilumekisopa.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/numagubetutolametalivel.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/ruwedefatejob.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/logadiduno.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/goxepinavonowidu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614478b32a813---77129600266.pdfIn PDF document text
    • https://eurotig.ro/file/sivam.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/91313087156.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/4453289550.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161391615b6e55---2296047361.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/o29vad0l1jkks0mov8aka4s1rk/rugalofiwexesulibenajed.pdfIn PDF document text
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/92773298535.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/3653a055396169a5af1bdf30c36df860/rafupageruwowevewujudap.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_off0000b637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB637 10876 bytes
SHA-256: 8ccf6cd835369a0caa09deb7c75a3b092cd7bc70de5f51a10226751b69c573ca
font_01_sfnt_off0000cf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF34 14900 bytes
SHA-256: 0858bc70c3dc564c4b668e69032de6c2c14e83297aef0fa85e502f76c2c20129