Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c72a4911ce539bb…

MALICIOUS

PDF

92.9 KB Created: 2021-06-26 00:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3e8c4b6eb883d747fa070805d3be5a5a SHA-1: db2e09cfe8755fccfcdf3a1760050425f1c93acb SHA-256: 2c72a4911ce539bb9fa304edd74fcace5a78bc11dbd71ee0a911bca4c77519f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress uploads and disposable hosting domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate this PDF is likely part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=i+want+to+scream+and+shout PDF link annotation
    • http://asupuro.com/upload/save_image/files/kapefikipozo.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-26/20210626021602711453.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/25176407134.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/jifulutobogesefosigitaza.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/ketijazezor.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fegosagopiteduj.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc2ece2d0---11207000182.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/xafapiloxufaje.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160732d1c2bf8f---mipugupavasone.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba4ec22c8e---burataxekex.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/d350cd4efe291b8222b8a93d3a9ef3d7/45717391082.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ad01375e055337baf1924466ae9b8a89/wenonorudeve.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2942da787---nimafozobatadogale.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/361b4c70cc2a3088be996f0171888a11/75961120380.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210618020254.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4f4a7f433---92928581558.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/916114f0e55c88a3a5b7d4e1e704832b/63557631938.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/03505f0e29f58f6375e5d32dd7dd4ddc/jewifokexujeluzalijajazon.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bdf3a92e4---60895323796.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a3719970595---89735806028.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3bd7d5c52---rutisugenutevisirag.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/pb3igrcdrunoq33a2sl9fu1ngf/basisegeripororezenumit.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a3ea7afe---xezezukozigamigazate.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_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 17116 bytes
SHA-256: 294c1165954059068080c044886f05c9acb05ec2d37021f87cde64357c876c0a
font_01_sfnt_off0001361f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E36 10636 bytes
SHA-256: 2c4fbc7d35c541f922b0ee459bf816e662a7c6aa3198a2bef9c8adadae9b3052

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