Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da31a936a6b6070…

MALICIOUS

PDF

62.8 KB Created: 2021-10-05 17:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0a0f0598fed03072e82fe3fea5c1ea0a SHA-1: 68a87b364367dbe641d5af9df0e30676f82d8dfd SHA-256: 7da31a936a6b607077f1d5e0503ebb8663f79262ee11c8569b1452cc10b351fb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URIs, many hosted on disposable domains, suggesting an attempt to obscure the final destination. The embedded JavaScript stream, while not fully analyzed due to obfuscation, likely contributes to the malicious functionality by facilitating redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6741

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 http://sz-nuoyi.com/Upload/file/2021090701183031107.pdf In PDF document text
    • http://parentini.it/userfiles/files/53038551630.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/bujifunezekolozewu.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/17463215928.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/vorijuw.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/88968254150.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/midawuzuniramufevuwo.pdfIn PDF document text
    • http://asid.rw/userfiles/file/96317003841.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/kuzopuba.pdfIn PDF document text
    • https://desco.scp.hr/files/fakebowevujimedudij.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/zejeleni.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/2983983930.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140336269cc3---85097271734.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328b7bea35b---mibizadumip.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/78860647889.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6367201195.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/rozaz.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/163171437861586784d5c26.pdfIn PDF document text
    • http://nantong.chinatupai.com/web/js/ckfinder/userfiles/files/43371553605.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483db7c207b---tomub.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/pikupezipew.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/gidipopetorawidanul.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/58560545928.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/3967200480.pdfIn PDF document text
    • https://balticseaheritage.com/res/wysiwyg/file/84634418625.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/nulefufopidodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kevin+knight+artificial+intelligence+pdfPDF 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_off0000cd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 17800 bytes
SHA-256: fa2246c3a3555e6f24b19e13bd301bfe3f29dfe3f55f996185c0e1a973276d37

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