Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c921864f39b4cfa…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 20:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07aaa7b4da21a7debb5cae51d8d2d3e7 SHA-1: 91f545cf1005675ca1dc4d3952158816ce636df3 SHA-256: 8c921864f39b4cfa7281f837bfe8548ed45696343541bc77f024cc54e25c8f64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/anhqcjg2vnsju0se60tubi6509/kunajanujekenulagado.pdf In PDF document text
    • http://aire-limpio.com/img/editor/file/posoxipe.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c157c048a---jorotipunisoxal.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/35426371906.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/jurarixevaboleguzutudiref.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081219ce796c---xatokejemurilujuxipima.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/tilade.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/3625361934.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/59642585382.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbef3293e8e---kuvubifofiselekuxewoxuped.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/terigomokezudananufesok.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/neminisep.pdfIn PDF document text
    • http://licausi.it/userfiles/files/lekipobelezato.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b30ee07c22a656acfbaacbfa9dab307a/dipizuwerodadutosu.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/facd02ff849e8e327341345d1861c3c5/zokiwinena.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b0f5edb626a8ee49daa83892fef5354e/mexewigesumajud.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/84323890041.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15cf3ada17---75729868413.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1380db70cb---rivebefavowupunigopumak.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/jagonidetita.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/78907753678.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12333a68a5---wodusemabujizux.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/924903444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=jorge+luis+borges+the+garden+of+forking+pathsPDF 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_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 11100 bytes
SHA-256: 4fc0ecb67246c47d56c9283355d64e28b62bd89354355f5c4c618d5601ba20e5
font_01_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 18592 bytes
SHA-256: 71d74ee4e8c1dd11ac038af08d24ee7adedf6089a790bb570f4418baee3b60c4

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