Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a12b79ea58531b8…

MALICIOUS

PDF

100.5 KB Created: 2021-07-16 13:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c76946475b9ff7aa06963dfb9f4aa97a SHA-1: 5cc9ba328e4d8c49cb0492205961cca5d43b3376 SHA-256: 6a12b79ea58531b8cc688759b786084650baefeeadc2b1fe5dcdd3fd5ce90c8c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites and other disposable hosting, likely to distribute further malware or conduct phishing. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 6

  • 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.
  • 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://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c79162afa---96282578688.pdf In PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9409h0lrrjlh3jd5pr48t7i7mt/85136326400.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/derekuxorabok.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16075352ff1c18---2130699993.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/55908424953.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf890adf18---jolarutulixoz.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/55339192093.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1b47da46---vapegatutefevogabe.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16af18b8b---41405936336.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcfe0c8a7b---66907155808.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/juwemepibukelunomezex.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa0d50e1d---37914470173.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b236b887939---refoginas.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/nomegerobonij.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16083f8649e1e4---jutupomufuveb.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/ae8lr1o7p6087lfl2qp8sf06a1/82825796422.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/687e2e67aae9e0a76121e1a9d9523c9b/defosi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842108b0723---vidodumamo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef8380bc9---pezotinisanolik.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/51241bc669c145fff663d276490389d7/zakozaturekofi.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5c8f5e378b3245382412d6a7a68c8c0b/13127273348.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/35690003847.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1f807fd2efa59778297514a86d50193d/sufomazutewapujig.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/91086030733.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/43320384922.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/02mda1hkhgrna50kt4vhnpg3i5/kozinipamakiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=minimum+road+width+for+two+cars+to+passPDF 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_off000125c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 17508 bytes
SHA-256: 36015bafb0ed85f3c764f8a0571718122f10cefe6394af46293f683fea3d7f48
font_01_sfnt_off00015343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5A 10888 bytes
SHA-256: f859c3bac3d4c1cc7d863f0814c6b3d85f87699fa37662625548ae7099402bab

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