Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc13b4a3b7f51f64…

MALICIOUS

PDF

89.4 KB Created: 2021-08-15 16:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f48e1d62e81110dc4bff222c9e23c5b4 SHA-1: 6fb5b7aaf412e3b80796dec279c59874117d44f0 SHA-256: cc13b4a3b7f51f647f1842a61db3896c9c0959dfb4191f42af522d4e50b81af7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature, likely serving as a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://philabc.ru/uplcv?utm_term=reacciones+de+neutralizacion+ejemplos+en+la+vida+cotidiana PDF link annotation
    • http://btc-ltd.com/upload/file/38486649445.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610e77c943f76---77957816088.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72edafa77---28849515285.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/wevokubirelavebok.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/jimesigoruwopuwifobawit.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/99081323730.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca19cce17---vakidogub.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/73267542436.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16110100453eff---10591768019.pdfIn PDF document text
    • http://capital96.com/userfiles/file/mepobanuvaf.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f66add9ee---fujomamisapa.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/42511652486.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/3228308198.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6adc67d431---92158642351.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/rrfpvlqp78v6u86s935ljprii2/67102298594.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210627_225941.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasawigitojufufise.pdfIn PDF document text
    • http://innersolutions-uk.com/file/kexulozoberagigodizu.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210614163446.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/52459632529.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/44951110622.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200080572796.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/fapetusilowose.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/gojowarumuku.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/71008584508.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/14666553194.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/63147483616.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_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE2 18412 bytes
SHA-256: 032c346433f74310f76cec0f92a7a5c74b1fcc292ab82ae659ab5cabb11a1b9a
font_02_sfnt_off00013a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3E 11076 bytes
SHA-256: 11ae9fe26cd3a511ee51275044e807756258be31a9cece5e762d12e779d073de

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