Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dd6c22cea0001b…

MALICIOUS

PDF

87.7 KB Created: 2021-09-14 01:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6c63f71b404a60c7e2b0139021e9406 SHA-1: 4f298ec005807635d1ddd5a995bd0c6c69f2316d SHA-256: 23dd6c22cea0001bffe3c17b79f01c7d5c890e4ba5913383a02c2de14ece1e90
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=best+walking+app+for+android+2020', likely serve as lures or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=best+walking+app+for+android+2020 PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dcf84cefa5469f40649a30d336226991/sovaxobowifinesun.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/rejatitiviliwodam.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/modosumukajazikotumobaj.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ce72d9913218ac5ec47b07293dce3ba9/xinejowexidupozunid.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2c810f6d4---wepov.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/8022694868.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/zatovipux.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19d924e34---14931813958.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/midedisowejimudejo.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109012135193641.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/54754800119.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/salumasidakijuvu.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/99816600620.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/tikadewuvak.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/13090190095.pdfIn PDF document text
    • https://seikai.jp/free_images/files/zirolovorugatofexipimebu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210905215414319.pdfIn PDF document text
    • https://durimawar.com/contents/files/pumoden.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/netapasez.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/poxenikusabokojutosu.pdfIn PDF document text
    • http://evola.it/userfiles/files/4790921685.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/aa36a53517ec8cbe1d6e51ffa0101d22/23875894807.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tutaro.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/29748788427.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/koputomatominusaw.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/52527319906.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_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 17640 bytes
SHA-256: b24a2f690eb5b527a8510c58e6faae1de27951f8bc996881674006e8c379bf42
font_01_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13698 11148 bytes
SHA-256: 38870aaef4902791c8d5f55d10a448a6221cd2fa2339aa158f175bb8b487b531

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