Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d61b19de841606…

MALICIOUS

PDF

87.6 KB Created: 2021-10-01 21:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 475e3bfdbbba22464e9f7fd4d113b98e SHA-1: daaae6a75018d1a9f06e7b5dd0dc41eeaa059f61 SHA-256: 28d61b19de84160636713afd4759cf14fd97f17cb884c0d48fe9a079112a50d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these redirects. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://exlite.it/ckfinder/userfiles/files/vajivakefozujur.pdf In PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/nunodisojudomuwaxito.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614995792bc8e---guvimapujarisedevoze.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/84579368971.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/58445300508.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/14489875243.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/rakuxibi.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/58959326830.pdfIn PDF document text
    • http://chineseclothingonline.net/File/15406596710.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/33147265528.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/14511266345.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/17400695175.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210905170138.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/vusozilutusol.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/38183952507.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161560aaf1bab7---8232276176.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109102328333539.pdfIn PDF document text
    • https://mkontakt.com/dat/file/11326394547.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/sujule.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/15910132240.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/xoribedazexululupulowa.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ae10774df5b29f3905858632388a2b9b/15052132305.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/xafezubawur.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/50499268465.pdfIn PDF document text
    • http://www.bash.cl/media/file/87007408760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=baba+meye+chudar+golpoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013704.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13704 16788 bytes
SHA-256: 9fdca7e42d1c04540e6930179030842b73a288934d5e121bf64963f10150c68f
font_00_sfnt_off0000ce39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 21808 bytes
SHA-256: d120df57c7fcf3955ee51eae15bdc064fbe7907a4a59427b3b73c3322584c0e6
font_02_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 10904 bytes
SHA-256: 21692b1f894bdd7d0e1ba10d6199630ffdc078125ab1daf4f1440d0b1b8b95c7

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