Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f7190d14012e9c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 23:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a230bd50da06d473fbdf5c731f8645a SHA-1: b82be9117a4cae8f1718a3138454a4ff45fc7e4a SHA-256: 50f7190d14012e9c956321ade9cf7ef3058790e80793af73a8195f45a348e2b3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting it is used to distribute phishing content or further malware. The presence of external URIs and link farms strongly suggests an attempt to redirect users to malicious sites.

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://wastran.ru/uplcv?utm_term=libro+caperucita+roja+en+ingles+pdf PDF link annotation
    • http://naturalmis.com/userfiles/file/81152582875.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/givixokepexa.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1914bb5ce---rawawifiwatenijijawizot.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/45258453245.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/2e7c5b6b08368b6d838aa74e538b04ea/gosenevatajow.pdfIn PDF document text
    • http://atek-ent.com/upload/file/verupikaw.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/1miebd165tud4qnt8p567t1jsk/98268094168.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57d29b3a4---40496829073.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9cd8984f25f6a24e23108e98b5700d4/59605378547.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/rivexejigejeso.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/88608573347.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e876375e57---bofatozasadukupenenemezot.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/tufazilegunu.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210803_67A17E46A51E98D0.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/nozused.pdfIn PDF document text
    • https://bamor.org/userfiles/file/zamoxezanoxerevoxesegajuw.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/10284466404.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a30331b1ce6---75371446359.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jutozidedajen.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5dd05d58b08850c8bedb78dfa2eaa5e3/ferojixew.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ffe4ec232765979f7737fdbe9f5c102f/tetinivodiwuv.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1be0a879---notipalukivixatuju.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/20475929841.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_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 11124 bytes
SHA-256: dd22938fcbc0e4890f96cac31673aafeb237c368f3439838d12171743e753db6
font_01_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 20092 bytes
SHA-256: c9f491e63de01014027791fbc0ccb5e727d29bfcc59e677f184dd2cf11854605
font_02_sfnt_off00012cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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