Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc22432aa603e6c…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 09:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70a63bbde4b934b0bfdb095a459b703f SHA-1: 3f39a8f8778b203527b31123cd2b7ca1e934cff4 SHA-256: 6fc22432aa603e6c06e29e7cf3d34cfcc201183d271780afcbd13ec7a65c3dd9
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the ability to determine the exact payload or lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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://newcar-rental.com/uploads/files/202109131144334057.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614337a2a7e38---vulor.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/wunukumubafez.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/xixajovu.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/litodo.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210918164357.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/65668717686.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/demurigojigo.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/fesifubajovare.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/jubefifubakesekakukejos.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be71699623---1729034452.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/zokugifejekavizuv.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/21015146231.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/sogojebelinetesojezev.pdfIn PDF document text
    • http://yilip.net/userData/board/file/sufefusi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303d60120a2---lafenexowobumoxebotiz.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210917_31CDD9E367CA51A0.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/xapogoroj.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d89f45ad1cc9a2af5d603d118203bc6e/16025409788.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/xiwaminomijimopisujajotim.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/memaloriwavusesofikixeg.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/69754860139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=household+items+that+start+with+ePDF 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_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 10588 bytes
SHA-256: 80f2ea4e88d73d4785dfbf64ba1d77aa849e22b5ddbdad9db0a74b4add70ab47
font_01_sfnt_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 17336 bytes
SHA-256: 2475649dfaccafcc9e479116b08940f632ace6dafe4011f1e7dea7173ea02cf6
font_02_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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