Malicious PDF — malware analysis report

Static analysis result for SHA-256 083e7f4cddcf23c2…

MALICIOUS

PDF

55.8 KB Created: 2021-06-19 22:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa547f5bbae7f4ac6c5e0b91ddf29df2 SHA-1: 2f101c68211a3123592bbdab52f5712a37e28aee SHA-256: 083e7f4cddcf23c273a6f2963bf80184b2412f433a66412c00506ffee748da75
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9186

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://irlanc.ru/uplcv?utm_term=full+cas+edit+mode+sims+4
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091a9d962ef1---50881570836.pdf
    • http://imhkayseri.com/resimler/files/99575337781.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/77538630781.pdf
    • http://yongqingtech.com/d/files/58138098399.pdf
    • https://tusenfotingen.nu/anvandarbilder/108/files/10516903513.pdf
    • http://dgjst.com/upfile/file/foveviwuxuvukixa.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8eeed6664---worugu.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160bfade2e56b8---90531257443.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/77970826171.pdf
    • http://poorclarescork.ie/images/70216776043.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/43g216nb6guudtqqi9lmmakq84/fokabitozivukeme.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee9192dd7---38253346237.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/53240621549.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b66bbef48---64488751100.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9dcf3621e---78812953934.pdf
    • http://rdmsrl.it/userfiles/files/kojujiwoxugusuxoj.pdf
    • https://gamasteel.net/userfiles/file/senojo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c77e.bin
d6e33fa3f4e5f1659e50ff6838c50c4af23bd4a8114c09e3697d719821413b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC77E 4808 bytes

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