Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c57be4f11e6045a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 03:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f04266f528b632f464f37d88d42ee8a8 SHA-1: 45c7f09a2c159e4b1a478c19ad508a78c6ea2e45 SHA-256: 4c57be4f11e6045a0f7a52d20d6cd1764b99a576e0e3200aee454e4232182f9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' upload directory. This suggests the document is part of a link farm designed to redirect users to malicious content hosted on these compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d512b302e---22705906976.pdf In PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/65437426629.pdfIn PDF document text
    • http://temple.mo/userfiles/file/fogumipupovumuxutar.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/27541100393.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/teloputakiwuforavitakoxu.pdfIn PDF document text
    • https://iword.de/userfiles/file/51507110568.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/68830157786.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c862bd03d2---72979652266.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/4ge6hr0cn9qh1fgkmjvhv2kie2/62809409402.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5600548f9e---gudonavozixuvodifetumov.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/berorab.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/e83321020fc76b86beeb642ecef08cc4/kibed.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ed8a1fcfd5f29af51c5ed291c911f7e9/55823319324.pdfIn PDF document text
    • http://wirheiraten.de/images/file/putopadob.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32154655193.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b5751b9c91b17e9b527171500a26d497/24281476092.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2e3cce2684bbcb99d4f08542c78709a7/68102433423.pdfIn PDF document text
    • https://norservis.com/files/files/48651500375.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b7daba09220a34d51b8ae51a258cefa4/31352102932.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf92149f0f---15996356295.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/69684319551.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/taxopuxinanap.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2020f19f50---femudemug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=redoutable+d%C3%A9finition+pdfPDF 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_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 22796 bytes
SHA-256: 13cdf9c3f007e037e1b9c33b1da732afdf6d42cb4ae58973ad72d1b120763b62
font_01_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 10664 bytes
SHA-256: c99985bcf22ef7816f90e18d2e8dcf8e5cb8bb17aceac8d75fcd650bbcb98a86
font_02_sfnt_off0001220c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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