Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5c8a282b0144a6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 06:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b6ccaed8289d7331e286933d15808f91 SHA-1: 75652b5a798dd23cc51e078bfb93dfea582c284d SHA-256: 8c5c8a282b0144a6c61ec612a5ca467db267c618a1f2cc92be9e7596afabf054
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a secondary payload. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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://wastran.ru/uplcv?utm_term=jack+reacher+2016+torrent PDF link annotation
    • http://arcstema.com/userfiles/files/47055605913.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1b43b476f---35617951993.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/75234365910.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/zitokutiwe.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/89335836011.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/89787987483.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/lopuvilufulunufigal.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/01a797a71802201d1fcbf3de350a02bc/18442505298.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/biwojado.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/k975b2t2s9j8nt46mnaudpqt14/26779547590.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/77e67ab735d88f64519379b07cc625cd/xumufiwilupemuzez.pdfIn PDF document text
    • http://d-innovation.com/upload/files/74779845165.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/misito.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/doxudagiximiwonalewafi.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/rubeje.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/lurokilelesovuv.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/31291638464.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/kojekafirufus.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/zegasazowoxudaxerizasod.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/10056518862.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/xaberegolib.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/97684963287.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/nejuwi.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/17828308665.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/6600400895.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/83904052362.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_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 19688 bytes
SHA-256: 31ff0112a1be39ffe9eb1f806bbdf4cc96966a9a8569a7027de9374e14d40016
font_01_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 10568 bytes
SHA-256: 560dbeb4e0a706e933cbd1a2b3f3d44abd518be76cad0fab1a87eb8cef55673f
font_02_sfnt_off00012738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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