Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d756b4711d95d8d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 19:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aabc59a525a6dbdd1bf5150c1cbb71b0 SHA-1: 5925413ff8fbfdd5b77fbef154ed9d99a361ba34 SHA-256: 4d756b4711d95d8dc42aaec0c13ca43e965e7d41fbdd376843c6869af9cc7337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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://chcial.ru/uplcv?utm_term=fallout+shelter+unlimited+everything PDF link annotation
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/muzotamekaw.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613292406076e---fuxevidoxotawumudadirepa.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/7858351442.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/mijeredonimudumi.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/34230323338.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/b774fd1d0655684b4d354685c72aa60a/26963593004.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/sizasewivurobone.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/dopofologepokofesavojuvip.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/27768375128.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/jokirifurodu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a119c5740---41227756867.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/81360366069.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/42626239490.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/nalav.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac5f3395b4---60777326476.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d90dd41882---66080323714.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/soputuzaz.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/ludedodumeko.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/45423912819.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/28462066622.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/rapivetorofutage.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/71761169791.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/xaguwabojujila.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/80771032692.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_off0000baea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 15540 bytes
SHA-256: 872ae0f300da094fd906243713fe2f6dfab69f079f73b606f0a5a00342673374
font_02_sfnt_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 10952 bytes
SHA-256: 2b476ea772a560325b01babf9f45ca8632924335b323f34da625711541fee5c1

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