Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf35cd4bd807c61…

MALICIOUS

PDF

71.4 KB Created: 2021-09-03 11:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c1f2d092fe05b733532b655755d4a89 SHA-1: c7768448159b1e16a64fd752ebc8eeea879f2725 SHA-256: 8bf35cd4bd807c6119c06ecfc373ee57dcbc23721e867649881f049f772eb8c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for distributing malicious content. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and a high ML score further support this. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure, likely using embedded JavaScript to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://prinsart.ro/uploads/files/jibaze.pdf In PDF document text
    • http://pospatrans.cz/UserFiles/File/59139697876.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/63480311206.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/kurogijaxubetavaripulaf.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/96537765779.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c411b5bf250db509b60ef45cfbc643c0/dotimemakojixusaduwido.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/lirinatafazoje.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6613b43be9---83674996566.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/soramalu.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/xirebejox.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/67cba1d23c37f18b3f0c5e8fe5d459b1/51526609808.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/kibijetojuripababuxizow.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/rixalajobunapirevig.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/40470342707.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ajan35mi86ol81t87frr3i9hi1/26544060951.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/gifotolatadi.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16074752d86faa---pawizezefaga.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607074e9e3aaa---52020909311.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/518jj1ikqv1lra7q634lv255g2/sozinovemebadorida.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc869f960---15606235427.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/61102879699.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9480b0c88b---37427165822.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e40a2bf53---1660080753.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/70946652441.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f8125a223b26cc4e8ae7bced92ca568/6062062292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+converter+professional+8.1+crackPDF 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_off0000b6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBD 11096 bytes
SHA-256: 84a1d8e4b31226d84c31d7445fddc59965e32bf1f938c6be50acbcd52d7509bc
font_02_sfnt_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 15240 bytes
SHA-256: 62dabd90f15caa149bce81bc822d0e86443004ec700aeca16f312fcb41b1c9e8

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