Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed0487dda336396…

MALICIOUS

PDF

74.7 KB Created: 2021-09-23 19:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e02d6eae3e4811d264a550cf13a4884a SHA-1: fe84831f715cae94b20254965770b0842f85b9bc SHA-256: eed0487dda3363966e7ca1badbae42f6f43c3e5b2dc25b24e2021125aed28971
176 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains multiple external URIs, several of which point to compromised websites or IP addresses, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, likely intended to obscure the final malicious destination. No scripts were extracted, but the presence of multiple links to potentially compromised or disposable hosting suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/52798440468.pdf In PDF document text
    • http://poetische-malerei.de/web/editor/files/xalulatusivanaz.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/52439817613.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/70136184656.pdfPDF link annotation
    • http://chothuexeninhbinh.net/data/dulieu/files/pibumatulusubibusiwi.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/7876164421.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/58105821245.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/36347691976.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/58484168874.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/48522013556.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/caf61c5bda3012ee961b693b2eb559a9/8533429001.pdfIn PDF document text
    • http://csp.hu/editor_up/tutipudekekovo.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/57022510849.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613689dadc193---16061103241.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161462828c7b88---tinajidumorube.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/96747577208.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/19361253952.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/wanakozulol.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/61481490951.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/wifinilufazomanab.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/92204021387.pdfIn PDF document text
    • https://wecareprogram.org/images/file/lebulujijuxodes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+tower+defence+unblockedPDF 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_off0000c0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F6 10712 bytes
SHA-256: d4bec1bfe4b1aa090e38d3d5141739a93f0a2e3b3744c6a4623312fb32e60cb0
font_01_sfnt_off0000d9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 16908 bytes
SHA-256: cf2d1d9a8ef939668ada5f5603f16c41afcbf0b92a29fe88e0a0546af95fbb76

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