Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d32a047a7701ce…

MALICIOUS

PDF

97.5 KB Created: 2021-09-15 14:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ffe364e5db2aab4370f2efe0e9a75f3 SHA-1: 18cc5d675a8b0f246971ef81f04afad5b96737c2 SHA-256: c4d32a047a7701ce1240e8f1c342841b64ed837f6578c0164ad70cab25317788
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The primary attack pattern appears to be redirecting users through a series of links, likely to a phishing page or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=seeing+1111+and+444 PDF link annotation
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/42393374528.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d455c8ed---38840993197.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/23e662ff0369f082e9cd1f7ec6306cf0/68446060496.pdfIn PDF document text
    • http://yuli-china.ru/d/files/42868057833.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/jipetenopub.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312db838d69---22897952889.pdfIn PDF document text
    • https://egf.tw/test2/images/file/jumopajepikudatagafawe.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16134765756980---94494527263.pdfIn PDF document text
    • https://jss-moms.si/upload/File/45954718989.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/79951639682.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/92888098446.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109030952386048.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/6732228523.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/sabex.pdfIn PDF document text
    • https://stormester.no/files/file/totarajolosidu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416fb15e7c3---gazenekigedowaxin.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/73834810659.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/15273817134.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/rezosovu.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/38810870089.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa0c6501e8---8720504282.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/08c12781745ca947775daaabc42001a0/87900057534.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/45473304039.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/jetekukikarapizu.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/vififodaxesure.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_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13048 19024 bytes
SHA-256: 98f94ddf129cb6899d546466fdfa187a53eef7d48035bd65a5e9bf2e21843fe9
font_02_sfnt_off000161ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161AB 10096 bytes
SHA-256: 6fb7dc3a093711590b12edf07497122ec79daf67088fe9a9330c9d7544668b5c

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