Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d4014e78dfb546…

MALICIOUS

PDF

95.5 KB Created: 2021-09-13 23:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7326278f064520d6d26070da3b1f62e0 SHA-1: 0cc46fee62f263e02b0e92628b06d458f5badcba SHA-256: b6d4014e78dfb54610fb229c677c5b45db826fbabc2e8be95f553d240d8c5d1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristic firings indicate that the PDF acts as a link farm, directing users to compromised websites and disposable hosting, likely to download further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely responsible for initiating the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=the+conjuring+1+full+movie+in+telugu PDF link annotation
    • https://jmtours.co/aym_image/files/budawalikotuwu.pdfIn PDF document text
    • https://bataretak.com/img/files/file/jilaborarute.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/76365359776.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/pibogenonuzem.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613978eeb8668---kebijatotuwejotemed.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/44850425106.pdfIn PDF document text
    • http://airmon.hu/images/files/xumomememugutetaleg.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7dccdb2cd3f631cbbdb676aeecd005a5/wavibakudagawunine.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613921bdb1c25---66728602924.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/karakuve.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///jegufiv.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/rifevanigegoz.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/tepapigasebajozov.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/xavez.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/58799894838.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/35365066024.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/97780501897.pdfIn PDF document text
    • https://vleek.com/uploads/files/62172283503.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/18143099503.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/52100606519.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/52794437559.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/61205107064.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/dufilotatelebizat.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/kepemonedaliwibabalowosuz.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_off00010e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 18948 bytes
SHA-256: 72c87d5b864cd682e18af4d19ffbd844fe1b2dd89d9f05a34bef43053418071b
font_01_sfnt_off00013f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F79 10764 bytes
SHA-256: 3a58012ebfa3fc4b0e97f98310b6ee82195a843a5d55687ed6b1d6e2596ff661
font_02_sfnt_off00015813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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