Malicious PDF — malware analysis report

Static analysis result for SHA-256 534a2a6ad393935d…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 03:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77cd942368d6b552a5a626b258dbc5b1 SHA-1: 96279d79eea1bf1cfdbde1d9602bf394dd3d9f3d SHA-256: 534a2a6ad393935da21f36bdf462c9cda607f7a3b4d312b5b81a0bd9e424a2f6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brcassociati.com/userfiles/files/dimototadubabukad.pdf In PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/21994552725.pdfIn PDF document text
    • https://rajakedua.com/contents/files/95472350965.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/98804059969.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/46482381246.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/82563037265.pdfIn PDF document text
    • https://tekmaker.com/upload/files/vopitumuzesatijasikomojot.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/86033355236.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/07d5852927745b6c49e9ec5ceae5c0c8/posil.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/vobibem.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/75031799104.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/pomevatekizojevoragaxon.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/14031914851.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/tdj4ijf11no4sf7geqdr580sjp/jiwiwiw.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/porim.pdfIn PDF document text
    • http://anninh247.info/upload/files/mopuso.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/roxawipapujozapuzepujuxom.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145b6ad18bb7---18073014931.pdfIn PDF document text
    • http://tzsunup.com/upload/36400671240.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4456b5630a8374d0555e9289ea115079/52874526344.pdfIn PDF document text
    • https://edex.co/userfiles/files/losutafenupurokigatekapo.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/zefuwesowadifapepigugejok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=rally+racer+dirt+hack+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ada1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 16796 bytes
SHA-256: 51bb71097dd93debf1a532a1e7b155564670ab6b3e755ac1fd3b67441e47be4f
font_01_sfnt_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 10468 bytes
SHA-256: 33e5cc36b43b21071b8ab113d23299a0e02beef4742fdb5aa54793157de8e09a
font_02_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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