Malicious PDF — malware analysis report

Static analysis result for SHA-256 97469dc1aa494f9b…

MALICIOUS

PDF

83.0 KB Created: 2021-10-05 00:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0cd0199c17286b763c776163edd83797 SHA-1: 144c3680d0739063a074c7137ad1dd371ceed3c4 SHA-256: 97469dc1aa494f9b675b161c705d30043a8511e9541c4d3a52e32480684034f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a lure to redirect users to malicious sites. The presence of a link farm and the use of JavaScript are common techniques for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/35184457330.pdf In PDF document text
    • http://duetsepolno.pl/userfiles/file/85704412696.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/bonogi.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/65210247557.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/1680567906.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109230750059909.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e91996301c---jebagos.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06a826ddd---wibexej.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fee3d72f6---kodarefogugijafu.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/kowudewa.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/74691767167.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/xinozixununinarekot.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/26918959315.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109132247041984.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/35078266390.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16152af199d19e---vanaperon.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/kigik.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/18874232748.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/24285881647.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/45989731160.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/tiwozilunovofa.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20211022049131061.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/49837427863.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3576a26adafdf275f902e81dd8198e7e/97210348586.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/47202128055.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/vixaduginuvutojefixukaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+draw+a+woman+facePDF 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_off0000de21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 18688 bytes
SHA-256: 849f3a517a798e5ff63062d7b9c33c0686f67147536ff7e4397674cd13a1eff0
font_02_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 10408 bytes
SHA-256: 0055ccf9dc6926aac3a09e6021fe41b70d2f833205512c6d2652c0d3236c587d

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