Malicious PDF — malware analysis report

Static analysis result for SHA-256 831c8de9b0b24ce2…

MALICIOUS

PDF

64.0 KB Created: 2021-09-09 02:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a3af8675852f3527d662d8769273dfa7 SHA-1: dab53fc6dd5928abb78c0a581f75fabadb9e298e SHA-256: 831c8de9b0b24ce28f6e802cb7dbfe04aeb77fd74a8caa4807597279099cd8f0
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5692

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.
  • 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://pixomot.ru/uplcv?utm_term=watch+jason+bourne+2016+online PDF link annotation
    • https://saksisan.com/upload/ckfinder/files/xanegubojeroninavikabuwav.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/bifexituvaxadikaso.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b33e8edcf---80798839363.pdfIn PDF document text
    • http://zl369.net/userfiles/file/saxivelevumixefafej.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/fetoweg.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/45233541703.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/62525935048.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/34606483523.pdfIn PDF document text
    • http://primaneighbors.com/userimages/64502975534.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/kinapa.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/bokilujipilaf.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332a17eb06---zabepet.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/8839057759.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/82097503392.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/38484853217.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/80805909959.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/lutilubuxagozewadox.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/62360329849.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/bvmt14ir8iephtt34ll04ikp50/getukadogonulaw.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/64827484403.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/gilaluwopatesamamugipej.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/wosupotegerapew.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/71190540131.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/resutixawuvogozik.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/dasigafo.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/wabunixifudo.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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 11152 bytes
SHA-256: 6610330e6a3c7049d00f7f165634f203c767b2a4c6eb45943e7a08b2b5311014

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