Malicious PDF — malware analysis report

Static analysis result for SHA-256 655941f89278011a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 02:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e5b8138b0102998f06f3531303af29b SHA-1: 2d3ce94a678f25ede6f781123111fa1d74dcb4a9 SHA-256: 655941f89278011a487af4a44c60ec38c818f5f523cbac9cd810e07ca59e8176
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/da9059a3dbce7b067a8ab09079e864a5/73318621129.pdf In PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac9ae6aa7---daseretiviposuremawov.pdfIn PDF document text
    • http://nemochem.cn/upload/files/radevivasufexulomonuxum.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/senejajaduwo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613888ad19c4c---jerizerux.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/48064961710.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/75442941333.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613988188fcf6---dalumerasore.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/gosimuxulomuvunamexo.pdfIn PDF document text
    • http://identik.hu/editor_up/samoxu.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/genizezedotanimusatowos.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e23ea07be4a1f2e8bb6956dfd8ec6050/sizisubadagujifukuloxuzar.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/karubademanimalepulupuxan.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d5f48813---jitatubumexu.pdfIn PDF document text
    • http://bamor.org/userfiles/file/vurib.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/bonugav.pdfIn PDF document text
    • https://maviet.vn/upload/files/66017355577.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/8264619098.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/7262890371.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/filor.pdfIn PDF document text
    • https://bunianco.com/other_files/File/biwugukuvilalenanavabuva.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/rimutefuredipemezeduxep.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/remewozexadufos.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090909433280554.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/16252261737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=iptv+free+watchPDF 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_off0000d946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD946 10148 bytes
SHA-256: a0737f80e33445dffab1269a1c78c16fd5db94c0a890c8dcaa1149d71f0ee6cd
font_01_sfnt_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 18392 bytes
SHA-256: 83bc11b3d4e64bf6df1d608ebc36f2c1499d11d3338eb8256177dab5514c6bb8
font_02_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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