Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a05817ce22c2bc…

MALICIOUS

PDF

90.5 KB Created: 2021-09-20 03:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73bf0e631bff607faa05b061cf484a74 SHA-1: 6b2dc3adda4e8f7be509a05389f305d35700fabf SHA-256: 18a05817ce22c2bc52ea048208681e55b84f831918cd1f412f5bcacc347567f0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URI heuristics reinforces the malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 https://pixomot.ru/uplcv?utm_term=michel+foucault+the+order+of+things+pdf PDF link annotation
    • http://ephtour.com/FileData/ckfinder/files/20210920_1BE7E22EBE482CEC.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210912_B2ECF05D41EDF7BE.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/jimogu.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/ludesumefiwisigis.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210911_FAE2A5BCEBDBBF6A.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/49714391144.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354c0c18c9b---lorevulutivunutigepi.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/92410105762.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5e6ae04b---zofemoxigapiti.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/16342509254.pdfIn PDF document text
    • https://mimpidia.com/contents/files/19001940438.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/pifubopo.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/wonotobesi.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/neludadakewebozubijev.pdfIn PDF document text
    • https://senegal4d.com/contents/files/23897440681.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/xixenusu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16130c911da304---27663819930.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/39734318767.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/93817817542.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/32892506377.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/mojolopepefekituvo.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/mabipatobujowupimalenikej.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsbdlifav017ik4cso4c5ivab0/27985421508.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/83616843273.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a300f2edb---munijuzelijopizamarelof.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_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001119b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 19068 bytes
SHA-256: 85a3701c2153e32f32cca17d42e1ce9a425bac8205171cd2d436afb8640109b6
font_02_sfnt_off00014293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14293 10992 bytes
SHA-256: 82fc71d72e1c43a6616358458844d0c9d53a5dd371034da656f4d4c30fe73b89

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