Malicious PDF — malware analysis report

Static analysis result for SHA-256 166341cc145f9fb9…

MALICIOUS

PDF

89.6 KB Created: 2021-07-18 11:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f228efaa6077344ba33971b6446dbe79 SHA-1: cbb89835057f6f4e5f5e995270f5c2059830cc5c SHA-256: 166341cc145f9fb9b1afa4999dc5ac5579124bfd894f0c787346233be2a247dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a multi-stage attack where the PDF serves as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/0a028b5a14e05f2a7a9dddb7279413d1/47941635243.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e629a28780dfcd6cb56241671fd2df4d/91245617379.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9d98ae76eec947c4308897fa8da8d4d/fudidapuvekokezesegesi.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/97398134575.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/monuxerovirinof.pdfIn PDF document text
    • https://roshindelivery.ae/userfiles/files/sebir.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/af259ad09caf371c30e6e80ace5bed93/pesezixegozazil.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0b5c5fc1ddf9f82a49387edc41ce6aab/sojarepulopatobelefare.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/dozanipunilur.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/legasobi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb2f22e0f---18875260905.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609f64753195d---71619086473.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e18e17dd9f---nabuzi.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/vesazezolezewojorag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087adbd76f39---lovabanezazezuniretepewos.pdfIn PDF document text
    • http://bakoca.hu/files/file/posetuzisuvadakane.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/778f8cbms3u22qti33md5g6837/44697824565.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/55690701721.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/874c2120cbe8a7c5c28e9fb9a8158717/lutadisidozazadisajenunex.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/xusibebabutamo.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/xafopivutudozumeva.pdfIn PDF document text
    • https://invest.pl/userfiles/file/50288544112.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b946a18ea35---42491568558.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160768d6de650c---56369466673.pdfIn PDF document text
    • http://fitviewer.biz/files/file/pezusuliriwanikas.pdfIn PDF document text
    • https://advik.net/userfiles/file/paxasemumetazikopa.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c99b0c5bc8---ravimiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=men+are+from+mars+and+women%27s+are+from+venus+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_off0000f9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 18096 bytes
SHA-256: 29e0f7971c4d1927b805b9d2b4ebb3766779d449b36e4892f6d0cb764cc9a71a
font_02_sfnt_off00013ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF1 10700 bytes
SHA-256: a56204964018c6858fd58c0628d4d525baa0a715366621a638206de8288da1cb

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