Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c4bfdd51a7158d…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 14:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ad53f09cb06877a2946bb25829bf27b SHA-1: 995233879dd910987935fd42ad2ba8ab9635c12e SHA-256: 59c4bfdd51a7158dc31a2c3a9c8e06f4198577f6be2c96dd7896d4d72be2742a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=mendota+fireplace+remote+manual PDF link annotation
    • https://nisahanpin.com/calisma2/files/uploads/66634299239.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/pagiwoxoje.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/5u7iv3ofn0l7mqo44mdeq9okr1/monudilunonobobol.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/dixarakukewak.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/6017013616.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/89065713381.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/30227950119.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1efb6a33b6531dd5955bd2cced26211d/gutekajis.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ff159bf0360ee3991a0a0764e8c96a80/tegonekamanosogipi.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/15150896615.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160884a040af5c---2619489396.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/10078610464.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/kivegovowobav.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/fizesejeditopi.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/kavigowufejam.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff55e3cd75---32602173288.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/19543448697.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17919576964.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/51425996154.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210807044300070314ralgvj.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16214059645408.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c3a09fe169cf73f619d40bba39b3a104/jelanoxetaxititiwonop.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07ede6ebd1---80673466106.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/36815754584.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_off0000c974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC974 18440 bytes
SHA-256: c3b992422a9740ed42e09b0d805886cc9e1e45bc31d869c61242b8e9d24a7936
font_01_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 10704 bytes
SHA-256: 53b2dffc2b4d29b6edaf865ce9d61f928e0edb09dd57fd72138338208c950e8e
font_02_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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