Malicious PDF — malware analysis report

Static analysis result for SHA-256 29410aae36c8d24c…

MALICIOUS

PDF

62.5 KB Created: 2021-08-20 16:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8dbc583ec5bb4669f543a7fba01c9aa5 SHA-1: 3f9834e1bea117630f05d018f6e7c0203a126785 SHA-256: 29410aae36c8d24c3751b71c5b6fdf248e1301206586284832792dc81f91b457
202 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous links, many pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8283

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=mixcraft+8+pro+serial+number PDF link annotation
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qkj8khmopvir4u1hmf5ouonehu/63851723539.pdfIn PDF document text
    • http://nscenter.cn/upload/files/ruromoduvenibekedulaj.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/8834460565.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099efe90d9a3---34038629913.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/87187542206.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc3432e0bb---nabafevagusuvevademowojug.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa9855cfa---buzojevezepavixipifutaw.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/14570292284.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/xixukotomaxi.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/46439380358.pdfIn PDF document text
    • http://emannsltd.com/userfiles/45171765354.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/pezetizesudosav.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1610b387d9f13d---72823341205.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jo8qspuj29kvi40sntim6k56b1/22686668727.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/96375368610.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/zomurukazif.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3f51977c5---8785518696.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d00c83117---70520286704.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210627_215425.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/59679032469.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202107310253086168.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f2a032582f0298f2206403e64758122c/99160545038.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xonanemow.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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1