Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c27dbd820e864fc…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 15:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: adc8e150fd9f926d03529dda76b09cd8 SHA-1: 61cb3f48dd24663ad09b5b17764f1f3f383a3b07 SHA-256: 2c27dbd820e864fca2b1a8afbd36bec1544816bba3533cd0d731b5f826af51ca
164 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a malicious payload. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=mario+kart+switch+rom PDF link annotation
    • http://studioesflores.pl/obrazy/file/25065527432.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/80c4b174fb8affa84355ffda13108f29/lagibeme.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/14208725901.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zufutawolowag.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/77541011553.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a112cce28a30dfd0464f55c818264a2a/7906140059.pdfIn PDF document text
    • http://orderkai.com/uploads/files/91168542193.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/gidazifukaroridusoxi.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/ac417b097236ec0217b362ab29b0d415/46565272321.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/57226685953.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/58776902858.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/wadebiku.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3546acbb465560b84e381817596eef28/wirekusojemomufixotag.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/wibenokipusenukorijawos.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/zuvemaxoduzugapal.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cd537ec7a---nipuwonukotavuluwukejawe.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/35912058434.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/fepeginodafaremevir.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/topunidigufukuvi.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/85646948545.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/pepeximujivomusepire.pdfIn PDF document text
    • https://wineart.online/userfiles/file/21986058755.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pd09vieg2kugm3efh9i1o0fo41/72009185651.pdfIn PDF document text
    • https://fuoriscena.eu/file/25680964207.pdfIn PDF document text
    • http://jsdarvin.com/files/libajanipekoketemedu.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_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 18812 bytes
SHA-256: 64e025439d3585fcf4bc7431f40a81af93ccef6138db3bcb4c261b6e021024fc
font_01_sfnt_off0001118d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A4 10384 bytes
SHA-256: 0176219c4d5b443e9c2d12fb3d10c80296f6547a9a07061ccb14b214f4686535

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