Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9f0d0e63701171…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 02:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7cd23f3bef58f3ec60af705313d5c2cc SHA-1: 58b4d21de8834c779a41e61497218fa5edc76c48 SHA-256: ec9f0d0e63701171aead1d12abae5ac96b26d9a43347d4e032f05c0775aa24af
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://cructi.ru/uplcv?utm_term=connect+ipad+to+pc+without+itunes PDF link annotation
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d563d7ad10bcb6b205dadaf8e7d0165b/19763149481.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/37867018774.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/69691168244.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9d00ea2527e0f6a048658fe24dd69905/78076305692.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/41408622264.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/75113707638.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/lezolakenunigavuzuka.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/fubalorepofidogaxukuxutel.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/32145104799.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vugam.pdfIn PDF document text
    • http://melvin.cz/data/91416455850.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f132029375---6373484387.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16141d942108e6---63712930971.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210903_5A576BFA6686B0D1.pdfIn PDF document text
    • http://indemo.pl/Image/files/duzimerifepesekavemawotoz.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/zizuteketuz.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/36095616031.pdfIn PDF document text
    • http://robbes.nl/media/files/36180796605.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/taxisitirisupunixu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16131134f7eeec---77193284665.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 10684 bytes
SHA-256: b03e8f7dbc1d053742b38401d2c1b3cbf22abd6037c27bd203e983d572ce448f
font_02_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 18344 bytes
SHA-256: 823a37d3d43e8d6b051378ab8dd1ebab8d353b6e747a0fc3b902515fd02c9edd

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