Malicious PDF — malware analysis report

Static analysis result for SHA-256 0273d217b2eaf318…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 23:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 48c6adfca8f8287f92e92762a33c5b1a SHA-1: 90b807f9a0607db68531661c1233ba897e8f961a SHA-256: 0273d217b2eaf318de6115e78e242ad066a23993ccf9058e5b63ea158ba5ec63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are identified as a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=makerbot+replicator+z18+user+manual PDF link annotation
    • http://waltonjohnsonfamily.com/clients/870437/File/16317414457.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/56889096324.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/18693270380.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc4d6af3e25dd329e1c1bd3cd135ed2c/89044050200.pdfIn PDF document text
    • https://nevisnews.com/userfiles/bufusolurafati.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dcdb9f5cb---doges.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/renobupikilagetipoli.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d78dc607b457d760a0bfe23ff5c7c46a/16877363516.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/1a26koqu6b0ia02m3rp10r04f2/60257736090.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/fozazoso.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/86207110370.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/16412319149.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/33199227433.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/42750093470.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/67913435172.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab52516d9c---51937431980.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd05bc8b089---95826912072.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021815161881278.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/88395497627.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/25830714796.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/xawufe.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/mipom.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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 16904 bytes
SHA-256: 50c2bf4a8f009b6b3e5d884487813be7ebeec4addf9bc4d55edaae741457e10c
font_01_sfnt_off00010a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 11180 bytes
SHA-256: 5c312ffbc9d647c56660d2f61074ccabc11692a44b1f555569f8da75cad0ab23
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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