Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f0f418a46f6ecf…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 14:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b089579bc6971512047e9f74e2e1af30 SHA-1: 00279d0e831297b331591f87fddfba65383e88bc SHA-256: e9f0f418a46f6ecf82fb629dc922a7dbcdd80344563ff98dedc71ef1c4336599
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, with many embedded URLs pointing to compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier further indicate malicious intent, likely to phish users or lead them to further malware. The document body is unreadable binary data, suggesting it is not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/178d983e3cd74329465a82b8a961caff/sifamafasatugaxokofepuw.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7185b8e7---50202349055.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613337a0e699a---32005145882.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/jifusojob.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/nizomivumemojatu.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/68578924158.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/16919637794.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/mojobetafigibasaguvet.pdfIn PDF document text
    • http://lejonhund.com/upload/54646589839.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/67244725577.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/86517071593.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/davitotebugiwenogaketa.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/58505743704.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d1604243319c30da6063ecf48d8c024d/64009843201.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16316073165623.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b470ea837a---nazego.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131e27564c90---48679430325.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/14368360254.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/44441036653.pdfIn PDF document text
    • http://rrarental.org/upload/file/48804803582.pdfIn PDF document text
    • http://parfumland.sk/upl/gidawiratomurod.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/f1fqmt1cg2ht7tqgvjb5hc2ugs/80995001872.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/xilamufikewiratojito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+check+deleted+messages+on+androidPDF 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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 10984 bytes
SHA-256: a836b9323aa949d98e625e2349cb3380088e0ce2bdec9a34c71e72954682e195
font_01_sfnt_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 18828 bytes
SHA-256: a07ae5448ba2a36431eee1775081edbb5609807f1485408d91757f3a73169926
font_02_sfnt_off00012277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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