Malicious PDF — malware analysis report

Static analysis result for SHA-256 51aa74094f1788eb…

MALICIOUS

PDF

88.8 KB Created: 2021-06-27 05:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6f0e600d0d679f08055fd3acf4c66e6 SHA-1: 854b49d1e2cdbc34aa70d241b31afcffb328e67b SHA-256: 51aa74094f1788eb263e75d5dd81983a44a4be126dc2d58972116c8a9c87c484
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://queure.ru/uplcv?utm_term=face+to+face+cat+pdf+free+download PDF link annotation
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca6e68976---96063199932.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/425627f6d1b60f6b1d17cc134097974b/47848716663.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/juvopunajejejeloxe.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/41119820046.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/10548579455.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e224257d0---povuvetikuvutu.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/9404ca2f7d99f23a1cf223982c4cc91b/kimovabifelagurinudo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea0853c98d---74782131865.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089c18569031---59953201378.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/detujogudibawupavoti.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16099b93d6a948---kilirowaleruxigisusenig.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c082c8213a---lejiwororifewasijo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/85263928605.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/vosivekot.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///13352470606.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add49319249---logilel.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa0fe0f05---xubifelusivaneteja.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/tufubote.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a64b172833---63452164246.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/76719734893.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/6n6covc6eotnl9grsv8qrkgg5p/35091224251.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76b2ae124a---54308910473.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16083821350857---suzefoxodonawobidepokiti.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0io9prfldrht8jq4ppnaq1sgc1/rilenomavetamonivuwet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 22152 bytes
SHA-256: 55e68f4a74c33fd16ad3c5ad710476bfcc1102a780799c5dc9f18d333ef5b00b
font_01_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 10416 bytes
SHA-256: 3aa957e277dfcf1802e44b84bdec1ae113622bfc98db80fd161a9448478578ab
font_02_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 16660 bytes
SHA-256: 93f48e8f24d3ebf6720459c9c7f6b3d8f669a1ef7008ca43efef53672639d63a
font_03_sfnt_off00013d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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