Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24d567efdf9799f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 22:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f5be746c204da6b95aa8ae395b4f07e SHA-1: 09786e9255f153b0a5aa8b66552ac2d192bf7187 SHA-256: c24d567efdf9799f410b1b771b70249fa4138dc661a218759fb9246f4aacf6e6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=set+up+phone+as+webcam PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389ca650bfc---10621746481.pdfIn PDF document text
    • https://italvaping.com/file/xadatejixuwema.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/21812153317.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25764730142.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090504063333.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/lubanutako.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/golada.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/gikevesumexuti.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/bekadilisulasofefegi.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/jazarexolejuwenegipa.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/41287d10a9fac8cde032a5798351fb44/27030186423.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/cr52sjnh5157hdd2nrjej5mmt8/66341226516.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/fidusemilevumilamawuxovos.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/pevoso.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/lekaledepuw.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/14rb7j8ecalbnqbm8fagub78e5/bodaranitojilozepev.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/4288312034.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/ruvizatokejive.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/63510974884.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bfb4c6bc529a5f1e453398cdb4ddb109/pisagadawumogibejozade.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/wunimojetikovasol.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210914141421.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/3108022204.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/13397517937.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/58546368586.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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 17452 bytes
SHA-256: 45fbbbbdc6b57d1bd029c016c144da217c902340215215b12eb5f7bf10b640fd
font_02_sfnt_off00011d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 10804 bytes
SHA-256: a3e5163d597604f2ff707e9e78a6efece8ec5ac8eb34368b2abae7b071ae3c74

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