Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f52a841a11783b…

MALICIOUS

PDF

182.0 KB Created: 2021-08-10 10:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9580e222644cf87c4243ca0753cf4b42 SHA-1: c14b64b680e6d74dd49f3096b99f15f00dae9bef SHA-256: 66f52a841a11783bd3a0e4dc8f73a95bbe3152e0d51487756055db4a09f81baa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://smidgel.ru/uplcv?utm_term=cuento+de+caperucita+roja+mala+y+el+lobo+bueno+pdf PDF link annotation
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609359b9efbba---bigudogazefibugafogo.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/05/file/20210605_114623_154.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/56356808188.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161049c64d91a6---vasusawigelulex.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/12291098299.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/podoripe.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/danagogigovu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fa65a922eb691b1feca6c18027a67d97/latatamenisumofo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161117e55bc3ab---gewulelo.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c83e3ec48f---53151660796.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c1c0dc49---nopewib.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f86f1fd23---numaroganu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d801fb74fca---26852769844.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd22cc894c---pujemivevalozuwelabuxesof.pdfIn PDF document text
    • https://alutat.com/data/file/18142951919.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/55895064610.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/jaxed.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/wapagowazodopux.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/37264385739.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/63416149337.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/puruferapik.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/10496229614.pdfIn PDF document text
    • https://komodovo.ru/upload_picture/84175646102.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/66350734677.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_off00026447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26447 11128 bytes
SHA-256: c236f1c0dc5b5cea6f99988f102891c12644a74885587a190e718f43cc418b1c
font_01_sfnt_off00027e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E00 19096 bytes
SHA-256: d33d77c39cb190887788c78d4d5810e27e220dda9e3a618f42d9a91e4966d759
font_02_sfnt_off0002aed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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