Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ce376c2e0986a5…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 08:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d4553577e2e6e3df2d358890087c56f SHA-1: 1a7d4d6c6f0fa7aa1dfbc97f879c1cd542025dbb SHA-256: c4ce376c2e0986a51e20ea13d688bac6136729a090e37e8915db9e9ef396a749
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various domains, some of which are hosted on compromised WordPress sites. The presence of a 'download button' lure suggests a phishing or malware distribution attempt, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=sky+movies+hd+download PDF link annotation
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0fi8vbnrft971f9ioms02n6kbq/dejunaxejusosudare.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/wukifanukibogevawesum.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bee9e8f5ea5438cb9b6de733c09e4293/datizuvinogarerotaxekiz.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/48462319704.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/48962746079.pdfIn PDF document text
    • http://emannsltd.com/userfiles/mesad.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149398377162---41918220719.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/wijodil.pdfIn PDF document text
    • https://kenadong.com/contents/files/95585448921.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd2e527712---jefenitemekonubukot.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/17044266282.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/kupatufuxodemaxuxelujepoj.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210914_101233.pdfIn PDF document text
    • https://kopari.hu/files/file/lifejujuritupiwu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1f2f27944---21960316800.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/tagenibim.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/vuniwekigekajavigogala.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/nidapuxowi.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/2546474999.pdfIn PDF document text
    • http://risme.vn/files/makogufefenefusisobolo.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/88690402405.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/mugisafobetenokiso.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/kexibutupepibazezevubekik.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_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 17416 bytes
SHA-256: de3dbdda8be147322bf4ceb29d8e0a83a146b822c24581a3eb808fbfaa360dcb
font_02_sfnt_off0001304c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 10748 bytes
SHA-256: 9d37621461daaee7019386483c9cf61c16c1b4258d795eaea8ef19c6bf347a96

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