Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea454fef7ac51e9…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 14:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f3db4ee7bc833d58faa2f3e8b41bc0f SHA-1: 4d2176ca3507518fb8d56906855c3624114d8c1a SHA-256: 6ea454fef7ac51e92c508e0e2255a921177c58cd31fa9ac28f911c6dd52df9c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://shindah.com/images/ckeditor_img/files/reweravo.pdf In PDF document text
    • http://dichvuhieuchuan.com/upload/files/tuwureraxetojafirer.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/0eofuotrmcf8ck2isomvjhnr95/moxafes.pdfIn PDF document text
    • http://elitvorota.ru/f/file/27706821891.pdfIn PDF document text
    • https://temahr.hr/files/68908153926.pdfIn PDF document text
    • https://baongochoa.com/upload/file/kejodepilij.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/vedanelotas.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/41498004231.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/sofuv.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/fusaseximuz.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5a356dfa---serexoninodasoni.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/78058229097.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/zaxinifexufojez.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/86403030469.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/15449454110.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/37490579923.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/89094216198.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5919e076de7eab8b71505e7ef11f0f75/zusafawi.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/watipubus.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734e9e0c7df---zozisob.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/bodosawadagowogopel.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160894a95e6d1a---22076093677.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608029cbd203f---76758569982.pdfIn PDF document text
    • https://mfdesign.hu/files/file/jibovaximofubogomazov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ejercicios+para+paralisis+de+cuerdas+vocales+pdfPDF 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_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 10688 bytes
SHA-256: 7e1663928c9dac2afb7ff75b2cc85b9e100ac651e360459f46b090ac0da972df
font_01_sfnt_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11442 18176 bytes
SHA-256: 71c928355b7d1b8c19cd5099a9bb5d5eed22bf3c633f605d806168d4b981ac8e

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