Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fc24fff29a5cd6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 03:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2e287f73766ae0712556764d2761cff SHA-1: b1ee26368b59e1f6b96d980b6079447ec33a3f4f SHA-256: f2fc24fff29a5cd60ef6d9fb3f8d45a8ca153af92071ad2531b6b35e1c54d9d2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=zoo+animals+worksheets+for+kindergarten PDF link annotation
    • http://ducnhua.com/upload/files/xekidaxopasizeden.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c83922d5---tiporumijefinoleguzepeg.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160829aa98c9ac---24620831238.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/jibidoliwapazatin.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/67149892288.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/323732c630fc1c6417165b7ddf6fd841/fokopa.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/1116605224.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ede3d038a---papupifavedubutuwa.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d3564b8b3aa---zegadavuxemasidiwikal.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/n7gtvptt997os5up6cl01fdmq3/xirutusoxubawenedasamolob.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/mijokotogikup.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/lekitenagitasazijujefise.pdfIn PDF document text
    • https://dineflon.com//files/sudaxoro.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/durafaxidokizajoj.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f92f7cf92---72383394116.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/568369803.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/39834337749.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/41597465652.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/terabusigu.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/fepetemoga.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/86249906551.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/mogenekudigufotaz.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad03775fa0f---suzalipemotavo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329fbe5b009---28097581720.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/vatij.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_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 10940 bytes
SHA-256: d3abc5776ca68ed705de7ee171110e3f1e29e4986d7cffebfac81a19213a708b
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 16964 bytes
SHA-256: 7c6620507ff2ea8b67cfec625ea1d20ec66b5553bcd441523bc2024b01ed6b1c

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