Malicious PDF — malware analysis report

Static analysis result for SHA-256 578bfc9d5f677a47…

MALICIOUS

PDF

89.3 KB Created: 2021-08-31 01:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 239b1af203f916e0cb4b8c6f8d033cf6 SHA-1: 207c43f5f066bd956d05aadccaf1321057ae7172 SHA-256: 578bfc9d5f677a478b5841c134b1da7db032e63d3f9b798d34110d206611ad95
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous embedded URLs, many hosted on potentially compromised or disposable domains, reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://liniagdanskzydowo.pl/files/70659607471.pdf In PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/16548361605.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ipk38h6gm6lm1faklc35bq5j7/96412506676.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/45292802930.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/98679731285.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/jezopuzile.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/kijabejipafijukamu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161199a2e3526f---80993271650.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/10688050836.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c623f8d05c7db7d55cdd01490010b637/67516748714.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01a445c18a---tawugozebado.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b817a65f064---maretuxen.pdfIn PDF document text
    • http://thevale.us/userimages/zinedi.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/97349790971.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/bezododupusesazal.pdfIn PDF document text
    • http://uci.ir/userfiles/file/momabijokezomunalewavuk.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1b013beb4e9dee7354d5436498590644/52785554284.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/tovudenoxenira.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/muzafudutuzawabuk.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/30400581727.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/tefavugalugol.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/nejolamesajarop.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/34233426142.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/sowefivifuxixadijevaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=maneater+on+pcPDF 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_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 17972 bytes
SHA-256: 0af7a5a8f8e821e62b6d12b7d95f6bac48a8afa6526af8f7b00c1515a2f1092b
font_01_sfnt_off00012980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 10052 bytes
SHA-256: b49d5fc86274bd08421343698fbf9a2fd75ddfaf6610d4abe255dd798bf149fe
font_02_sfnt_off00013ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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