Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f156f066662256…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 08:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 716bdbbac9292483ddefe2430fd9c338 SHA-1: 2b91ece6fe68b0f49ad9896c24873960e5ba4472 SHA-256: b6f156f0666622568d7753f58445a90c0d2dbe33dd76d7f7d44d6f85128c6e69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5d4c6260691ed40c11839bf8d623fa28/pumemixoguvowaxona.pdf In PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/loterugirizolofini.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/62487213940.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613959432e539---95979431353.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/50365596281.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/335fd3qt0j6rf9u3kdi6e5ml34/38548486006.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/najawazoxusugasumasojuwi.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/71440023286.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/35458365373.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/bitulisadi.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/87546473412.pdfIn PDF document text
    • http://trieuduong.com/images/Download/lagozoponoxiki.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399946c8406---magejalerilexobovowik.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/17883202276.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/falezagemaxerewibevazole.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/96584636117.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/fotodafazasenajugevamazu.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/fudikokawapewowidozopu.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/63139143488.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/96764655033.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/jubawunopazekupiwam.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/bolukozovojidapijepareze.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/jowunabelafefumud.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5d454994d512ef174ec3aa9b636190ea/tuzumamizesiwizes.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/nukupizisepuzejipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=best+bus+game+in+play+storePDF link annotation
    • 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_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 11004 bytes
SHA-256: 29c436a32277baecd7a6f13c9004b97cc80e60bca1eb1bcd0bc6621c44c0c36d
font_01_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 17276 bytes
SHA-256: e18e310131fae394f441d0ff53ef29133456554d2927bc8f7360ff6e8e544867
font_02_sfnt_off00012394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.