Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18c3951f339cd4d…

MALICIOUS

PDF

89.8 KB Created: 2021-07-23 12:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ab0f99f55af518229e4c3872fd9e3fce SHA-1: e2f96fb2c4b97bd030bf906afd2e221979f0618c SHA-256: c18c3951f339cd4dd6c7a141949ea55cda935608a20f8568841e863d680f33f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV both flagged this PDF as malicious, specifically identifying it as a phishing or trojan distribution attempt. The embedded links suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909da501446---jileloremufuve.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/941cbe9239cc83df3af8582ff25f86df/859147420.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/solagugumuvina.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/damotibexedezex.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d7b4756047add40e0cd280300d344825/miwudosewanirejotolorebas.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/venukuwupusokug.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a08833ff7---40331514073.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985d7561195---zoguwizuvudidujone.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c719e2b2dcd---17322971496.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/433a8e35a4d68498cb9faffee4fb5fcc/ruloguzuvise.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1dbeb6b5a---11367173949.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/88458494490.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/3pr46viavpn1hbhbtopjetn6mn/tukemidolenevewubokaga.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/44104927978.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/lejaxafavi.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/zurapefogipazat.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/47653376244.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/lebidaguwev.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083f6a489d9f---93484835431.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b070c8a73---sikuxazewejujubobogino.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f1290e1f883---botuzuwukewinatevoziwugok.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabd7d88eea---joviniz.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/022ed6f1c2dc53ae774c85abbac505f2/bafufobo.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/29982721428.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/70886505638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=harry+potter+and+the+order+of+the+phoenix+watch+onlinePDF 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_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 17676 bytes
SHA-256: 23a385bcdd6866364b012c192be7252330038045f6adfa6c102fd3c741e8fec8
font_01_sfnt_off00012792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12792 10840 bytes
SHA-256: 169f3e0cd2a732b643d726ae9c33154531eacf0a43294a17fb38cf4958091c1a
font_02_sfnt_off0001408b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1