Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2b95e8c9bb0b39…

MALICIOUS

PDF

80.4 KB Created: 2021-08-26 10:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d785c506da299204690bd56a3c1b6b70 SHA-1: 1f3415744d10a4fddb566d58cf38230111c9f0dc SHA-256: 4d2b95e8c9bb0b3929791120290eb502a7d4b24a4f23f52e8eec17c9a69d4f35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the link farm structure indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb85b57a19---52072264914.pdf In PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a1b44eaa---4975617741.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/xamisagofev.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4b29beda3246f10690a611ba217e80c0/20993687482.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/80866954716.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2dd912f9149e0a4154f89441a9f3bb45/fakobekitesonapifu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/91ffdc29b97c6dd87ca3d6743ba954bd/kikoloj.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2855c2a215d573fa0c66310d41106d1f/85371896479.pdfIn PDF document text
    • http://halmar.info/userfiles/file/84481525181.pdfIn PDF document text
    • http://www.polni.si/Images/files/wazofalupojisovad.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/likebipimolujikefifaf.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/41966d18ba69b45e50498a23b9a68f76/miloronozikoduz.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b1756f7ffcae92e49bd928acfa86ee0a/78992114353.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/33342366748.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/bowenosapusadagoturadiji.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8ba6nf0c6qskqejab44qllavb0/75480687548.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/kirilovete.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a187855b0b4---gezazurevewog.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/mejuzivamus.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/13236823516.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/feviporelapaxoxudagixis.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/94142948319.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/kujeb.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/gomveu7rml18phki9nqql9todc/sogawuwap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=naan+sigappu+manithan+full+movie+in+tamilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A7 10848 bytes
SHA-256: 6d8b97233e3fd7e1e4825fac835963fa0739f73bcaca3a4ef8b50f9665ddaf1c
font_01_sfnt_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 16384 bytes
SHA-256: 6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe
font_02_sfnt_off0000efd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 16708 bytes
SHA-256: 137a906fee09e060a04f261e74949aa2b4d053a631d15c627449993b5cb3e3b1

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