Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a449e6ff637ea5…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 16:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3119e7d6daa228e114ee92aa06f31470 SHA-1: 4f8126e0514404f95f3366de54ec484e59f000a6 SHA-256: c0a449e6ff637ea5be6d9ffe21fda625be4fa8bf1d29a5a47a3177ddb4f1ea0f
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

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://krisoc.ru/uplcv?utm_term=live+wallpaper+circuit+board PDF link annotation
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/93e759bc3519db667cb39b71854ea621/bubinida.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2d54e398---21606900797.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///41073780984.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/16979404029.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161390fcfa4670---87751960795.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/fezav.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/69601038027.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/gitaj.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/72857557036.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142f2e463c3f---8516106701.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/78418783989.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/67373953818.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/nifalepedamozifak.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3a378dd0---rasubep.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/pomeramopaxononu.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/96763390776.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109151707336673.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/81274922823.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/16892969732.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/26127250903.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/fudiwi.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/16498888108.pdfIn PDF document text
    • https://eetravel.net/file/23611820391.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/forefupemobuwobavojinu.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_off0000bd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8F 16104 bytes
SHA-256: 735efc5ad0a6b8d27ab33ea98ae48650980538c933e46eef7aa51595fa509b09
font_01_sfnt_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 10584 bytes
SHA-256: 1008b7dd595f476257586b3d1c48db1d7ec42ea9551e667b3493b5e411ca9e73
font_02_sfnt_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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