Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13187b3f8c512bb…

MALICIOUS

PDF

72.6 KB Created: 2021-08-28 10:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e28f9262045cb36b99309ba5c46fb2c SHA-1: df084941928e318200079571bdcc3cafa44a1e25 SHA-256: c13187b3f8c512bb2b32dc7914e02ec930db7babf733e6ac2156cca74d4d21cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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=what+does+maranatha+mean+in+the+bible PDF link annotation
    • http://rolmech-strzelno.pl/Upload/file/tugarezoduw.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zawuvemapakeko.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/derakim.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a537728752---kakuligufas.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/56563756152.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/dosizobesexewimidetekiki.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/zorobovisuvijesat.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f354b820---pipekupukenokefe.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/pewivanadevinanamizu.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/132c81746b21daab1ebd021f6ba2c62b/83204551755.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0f5cc59e2c19bef92ee6e3a5249bade1/xoreluvakufidiwawev.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a47df539961---dagakabavajowenedidi.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e3f39120ffb14289d31930684a2ccb48/62035662046.pdfIn PDF document text
    • https://ibextrail.com/editor-images/teziwe.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c6ebceb9276f5915c35b42edfbd2e83a/52392836886.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/85854204272.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8faf2a5df7a4ec6667371e9022bda21d/1647812856.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/fk9o6a8dd55grv3jv05t0qonj0/penuxujiwiroxoka.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/kanagutafaraba.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/68722907423.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad49bdb3cc2---begenisivawilutunedu.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16291495782197.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/18345474710.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/jipuzuni.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/muvesaniwarozup.pdfIn PDF document text
    • https://semut73.com/contents//files/fugirekapurufixezasubovoz.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_off0000bcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 15664 bytes
SHA-256: 405bf605e8f06919b32f5e0d020d5418e8e02057438d2a08d04edaf0317a3bde
font_02_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 10648 bytes
SHA-256: a6ed20bfe7f5b041aab41da15dad4822e29f09923c58fa3b3261f5bbea998548

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