Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e27f2c5c2cfbef…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 20:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 395570841d2dc6641af277d3558e940d SHA-1: 303ad8ae1a9af79dfd6a6287becef67203268e69 SHA-256: f8e27f2c5c2cfbef7ccda31e9772520dd146fa02276a54e4abc0660fd226b3ae
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and compromised upload links points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1f0747312---kirulegekolumufudefo.pdf In PDF document text
    • http://a-pluset.com/userfiles/feronomiz.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/53358380233.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3aa33a766---ninunakevuzonanixepomaj.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/lazanodarevalojekolu.pdfIn PDF document text
    • http://selidbe-beograd.info/files/jipusejojunusegavoku.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/45418577113.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/98005543053.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/14633015237.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/21060899868.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/45498539143.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/47267158369.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/92765492312.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/50154428291.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/revupuzodude.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sekebowevajuxa.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/foxosevujigisope.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/df9604a286bd6393aa2ef1f5feced403/82335725756.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/22498386777.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/64853177402.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/nosasigudedizixibuwuso.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/51131831689.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/30078013957.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614285135e34b---zivisepugudurikon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+download+subway+surfPDF 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_off0000b1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F2 16132 bytes
SHA-256: b0c8acd5b789206731b2f07177e82dc80578414d89343f6d292d954b186b5b9d
font_02_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 10464 bytes
SHA-256: 656d8ba05f478318a431855b675023e35b1b94558c932f20f2965953b4cad311

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