Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9a6bbf15b83fdb…

MALICIOUS

PDF

88.7 KB Created: 2021-08-03 00:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d43b45d705a8b401f09d0f2707af0dca SHA-1: e1b94b08f8eeac6b8d7fc43f070ac551e388af8f SHA-256: bf9a6bbf15b83fdbeb89540f1b6b50671454cb2bebcd47b3ad0834d148c5c9b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to other PDF files hosted on compromised websites and disposable domains, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute malware or engage in phishing. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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 http://yenidenyuzlendirme.com/ckfinder/userfiles/files/sivebubeboja.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab8d96204---33594418676.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075e827aa6d8---zesuziwijowaluwuvu.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/72712547467.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/26654399821.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24f3c8bec---piwirosefesolizosenekeze.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6a47668327b70ce80d978b6d892e7665/pedubenemuf.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/fivuvixufaxewovibero.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/kazibupez.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/liweruzotujuvuresumas.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/87dd5b80dcaff55cf39d84e2ea487186/kiviravusezarepugexekulev.pdfIn PDF document text
    • https://dhesient.com/media/pulevebufilurosafidubit.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/96757477622.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/86646193486.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/58612cbab9c7b7302afc6e8a4fd45598/66709423248.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/64271859598.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/33659897536.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/64945638320.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e6a8cb521---36687263917.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/co2u0lb6f1k0ttg788b7l8jcj6/41285538439.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021726104388204.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/43f8088f6a3fc4deb56d840e74ea96ba/mugojixasutabulu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4afdb85247---wutufog.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/12253242154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bianca+nieves+y+los+7+toritos+chapter+5+summaryPDF 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_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 17500 bytes
SHA-256: b1ffd1818fdc70e6c6450f4b823980fcd093df02020cc8ab53afb334510c75f7
font_01_sfnt_off00012083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12083 11156 bytes
SHA-256: 9d05a8379d2a2697b112dde2316003a5273bade4be08b78423f8caa950140dff
font_02_sfnt_off00013a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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