Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3961477f03662ff…

MALICIOUS

PDF

78.8 KB Created: 2021-09-25 02:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4a54c00202d31734035145911e99c5c SHA-1: 36bafa75c95db081c3b1244195884446058a8343 SHA-256: f3961477f03662ffddc8e94c94df1d6e20ca4922a608a8c43c375bc6a7a72b54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to external sites. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=android+spyware+free PDF link annotation
    • http://voszveszprem.hu/_user/file/letutomeniwujenorusi.pdfIn PDF document text
    • https://daotao.cungthieunhidanang.vn/app/webroot/upload/files/magefon.pdfIn PDF document text
    • http://livestocktool.com/d/files/molusupovugagadiredarewo.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/notinatuju.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/76931444627.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/38047403685.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/5669233512.pdfIn PDF document text
    • https://slide-bearing.com/d/files/15084009451.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109011738488481.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e74be7616---29576657429.pdfIn PDF document text
    • http://kaies.net/upfiles/210907205601809088rvmtd4.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/464cc13729f6de480a8361667a3bcea0/41915317572.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/xalatotuzeju.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/zorazukozuwelebaza.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mujesabo.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/56232a66cb0c406d526025fd047ca76b/dezom.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/sipigawujivir.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/tarurodajerutumopibimime.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/jopetikamajuwigiwobof.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/jimakofezubigisudivu.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/19/28597862772.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/zevapepo.pdfIn PDF document text
    • http://7profi.net/userfiles/file/xizefodezinilom.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_off0000ca61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA61 19028 bytes
SHA-256: 9f15d1e046510ec515322964acc41cb13a07897afa94cae834f9ac02ed8738cc
font_01_sfnt_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 10528 bytes
SHA-256: 65f2265839c113fcbc977ad714484b4de1140c6c8d5ca4598c2ca074469fc0b6
font_02_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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