Malicious PDF — malware analysis report

Static analysis result for SHA-256 5226a754d62dda1f…

MALICIOUS

PDF

89.4 KB Created: 2021-09-01 02:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 683f422b5a0392fccae9792000108ce0 SHA-1: e3f54cfdb9b4004c1e601bdb8b64dccea5a6debd SHA-256: 5226a754d62dda1f2eea29168689e0e522ce1e1605d62ab280eae6b1a909b4cd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://medvor.ru/uplcv?utm_term=linux+convert+pdf+to+ebook PDF link annotation
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/3701763ed0a4f1db70c52b920ee7c92a/65834471823.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/teguvopowaponoxizawax.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/rajid.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/56959595096.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c66c56468a733637a2100368e752fd6b/ramiwadu.pdfIn PDF document text
    • http://webbuilders.com/files/file/jasalafudawupefilo.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/30859382008.pdfIn PDF document text
    • https://soechi.com/userfiles/file/69553136773.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c28de99f8e7---23442277928.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/aa1c9d458cd732ec55d962a3c0963e7b/79377752924.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/nawejewijigemitedadageb.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/rodotidapokizov.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/dh5d4i3sihv1e54o0jqvko2mq8/19232056431.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160899118c9ee3---vapogenujovanur.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/xujowafa.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7a87047ad08e2ca712d4c206889861da/19200410485.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/39165649447.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/82130289664.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813a13c2925---44621212384.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4937a9d562---210958928.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ko49ar0b1nnojoqq33gsgegt5f/liveliguzuxodax.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/selosufug.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/7601348721.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119671bbda25---nosujirifopupipuxik.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_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 18464 bytes
SHA-256: 436d97f876974536865940da3fd44fbb779e3d12f3997c9fde4de698ef15e0b3
font_02_sfnt_off00013ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECF 10696 bytes
SHA-256: ba68f7946f450c78cad7143404a4b7ea484670c070f31fc06426533ee2c98a0e

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