Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ace3906a83a4c26…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 00:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02b3b2440ddc35cb548a5a6f86523320 SHA-1: 6e9d634e44eab56c0c7d74eff1e57c2e8637d3f2 SHA-256: 4ace3906a83a4c26313786f9278ab66019ed6b90c035af4bff0eab46ce00ba02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links on disposable hosting, further supporting this malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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
  • 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 http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/98367334098.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9c2219417---pirevunikoxadirozi.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee25de42c6---retutetawixixixujefagesug.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16082e99926f67---68810564896.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83d3c64cd---66761752867.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/80f5025db8d9669d3d3aa7bd1b15102a/65194648448.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/68191859177.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95974692191.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/4215102873.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/nidezajaxaxelo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/mubefaxesazunonogedemesu.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/20971332421.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ve0tnlapd4tm7jl1hd109uqhni/10662390595.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/21298037867.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210705132556.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/68515158450.pdfIn PDF document text
    • http://mousike.it/img_ins/files/betojugipufefepemejaf.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612555560ae68---73741161864.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/seradoterejavu.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/83613317437.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/mufidupavafibip.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/lirobuwojaja.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210709_EEBE4C84B0C627E9.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c03ec879cbb31722b28fa3976e42397c/zukuvinonal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ecmo+therapy+pdfPDF link annotation
    • 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_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 17284 bytes
SHA-256: 7db36a118d575ad16a38c87b9052410792e5f849577562f4ca3ff8d768e71bef
font_02_sfnt_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 10572 bytes
SHA-256: d99845436af53dd85dc2d1bf56601a0c42fa8d1e8faaba05f6fcdba79bf7cd74

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