Malicious PDF — malware analysis report

Static analysis result for SHA-256 73761de6c62ac0a3…

MALICIOUS

PDF

89.5 KB Created: 2021-09-19 09:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa99155599b508fa22439a1ce99f5eed SHA-1: 6832f19c17254c12f888e03046f62bf8980ae4e0 SHA-256: 73761de6c62ac0a3b7edd24875c945124011288de9917f2110312e3cdebde4ce
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to various domains, some of which are identified as compromised CMS uploads or hosted on disposable infrastructure. The primary goal appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/20684548510.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132872295b5e---sezotuzumigibabojebujatav.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/6581873933.pdfIn PDF document text
    • https://yellowstonewildlife.com/nezoro.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/bexipuzoxupuwedaru.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/52523361479.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/lazubukaf.pdfIn PDF document text
    • http://carszana.com/image/upload/File/vedawawepoxosu.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/tavugunajeriwigawo.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/30052844009.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161363bca80d80---64302951717.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613785e34f724---83337806570.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/palok.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/dagejawonafizij.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/najesadojemolaxovasusono.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/78609975816.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/rudix.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/72472410564.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/9017388487.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/gimazafalikululiros.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/wufopesisewolij.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/82666338885.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/62935216308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=list+of+gerund+and+infinitive+verbs+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/912225acd33c9feeb4fa80c11e258403/98901379518.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_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 19360 bytes
SHA-256: 0f9a4ea969c826a629d2d6ed273481c4c291a58dde66317b7a62573cde797284
font_02_sfnt_off00013ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE9 10892 bytes
SHA-256: 03169b6c14ddb7c0edae7c71b4727f130d8e3d642f30327d4cca30bfe9af7013

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