Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a31f1217d92328…

MALICIOUS

PDF

88.7 KB Created: 2021-09-04 14:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddf58cfd54367ccb0d026d314efa0739 SHA-1: 65796310bab76586993e71cdaa2a5b8ac7413a43 SHA-256: c3a31f1217d923284940db1bec36bfad64a75bd9403ef2aa01bcbeed6401780b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic findings strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://eric-parnes.com/ckfinder/userfiles/files/82907975441.pdf In PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/151471786dd3171b33e6618773eaba6e/8413783937.pdfIn PDF document text
    • https://digireg.nz/upload/68265777174.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/t327ktn7r74h3sphr564s2br7l/nasisodokufejuviwu.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091c15f0ccfc---62866601425.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/10919735570.pdfIn PDF document text
    • http://ore-processing.ru/d/files/66301933348.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfac2b3a23---vixod.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/cdrjie37mnismsj0focn23l7be/31958233882.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/39044eb7780a931a61b1589afc2e4d90/wukaxov.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd76efe84---95516122662.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/36474811540.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/98b956e9373fd9e4a1f4705e900cac91/96842438420.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mogamezalu.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/96247877737.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/natuwinawovezepox.pdfIn PDF document text
    • http://goref.ru/files/file/78492179947.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/laledipaxawabimofip.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8796df787---44603372456.pdfIn PDF document text
    • http://0851gay.org/userfiles/202108file/2021080610201270554.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/vilimewekurotavifamibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+be+a+better+husband+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_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 10772 bytes
SHA-256: 13d3ab24057ab5e5a1f4a7b64561e988110c315a4e0a6c554fec1cdd1c02f076
font_01_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12784 17600 bytes
SHA-256: 373dea9fa91a3e1b45f68b097f64a9d5503ce99b667ab7d6bf1f018de31f7f05

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