Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e5fb0390f09dc1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 13:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6c42b58c542cb6022b4fc9505d9c08df SHA-1: d01f13eca25508d3a8ea114d13c6be851376bbf8 SHA-256: d8e5fb0390f09dc12eec2669c545eda057d9c40a208cdc2817bdbcecb3458d0b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download or interact with further malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://rurisnet.org/images/file/fidugitotilepejuvoresano.pdf In PDF document text
    • http://autofactory-jin.com/js/upload/files/dulezakururatepukosek.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/fazitetipe.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/dioidg0uurhlhldkip4t53sgn2/36706343873.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/majopotinenawaxusad.pdfIn PDF document text
    • https://panoramabyty.cz/content/tekomimu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4ff2637c4---magirirowukujopadali.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/luvivu.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/natufevotumil.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/13080498747.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/juxaxemura.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613522775a800---82295815487.pdfIn PDF document text
    • https://mytopics.it/uploads/file/lesum.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/bifekejesesunekawitadeg.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/betojagarifegivoxajogeba.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/fufowizivusiz.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/93724089017.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/95843194430.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/37200110148.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210908_2526C94A087A7516.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/netakawivemezadisojaxolo.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210906203013.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/febifo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ktl56pnhbg822ou54klqc63ip4/javabagog.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/jeroxomumerebolujimaduluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=droid4x+emulator+download+for+windows+7PDF 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_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 16916 bytes
SHA-256: 669d5d3fe763c18ddf8cfddd14755f8b5b9f4f12a7847bf20ea19069bb763756
font_01_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 10932 bytes
SHA-256: 4c28e7551002e327558a2ebd3c74710b164aa495a807d30e15538309468707f9
font_02_sfnt_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.