Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2977f73e18e613…

MALICIOUS

PDF

99.4 KB Created: 2021-06-25 19:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2b8526836318887307bd4ed667079e98 SHA-1: c7329923932f6157db3b82da650e1a817503b336 SHA-256: 8f2977f73e18e61373fc2b6e498b14fe5cff724c281e376275abb79849700b7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload directories, which likely host further malicious content. The presence of multiple unknown URLs suggests a redirection chain designed to obscure the ultimate destination and deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160820ca40e694---6667049823.pdf In PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/2bn1ieokjn87r5uj5ueca3kf5e/ludozas.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/115c0ce4f1b674241ec8d31c15254acf/41935473017.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/zepanetowisibevazorefi.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/kezebukusoriwufevuwu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ca0fe57af13171a26f83066acd789f08/99622146495.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c80dd8b7b3bf6040c93c67b90f0d3150/80607530020.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5a708ac89ecad012dc1f4a1cf95c99d5/20608088168.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160729defabdb0---89370940867.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a999afe8b4dd01483c326d94f0db2378/kebogibupekaw.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///terunoxewulodorezidimijaf.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/82429912454.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4cce6b89---fixiviliwopevafisuter.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/85039757887.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/5d5975816c11eee0b9e2de4195719574/xufusuvumimabezisekeki.pdfIn PDF document text
    • https://hirurgija.me//files/kimuzudowivaniru.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/dapopu.pdfIn PDF document text
    • http://93564497.com/userfiles/59523017952.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1e43009c00b4846784b89d1c4d106aaa/pifivisi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b0292055---54443201911.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/vepibipupovotimenufewot.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/g504ahdaqpvo4760u37b7p8l7d/51654949518.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/6542492457.pdfIn PDF document text
    • https://f-kcc.jp/user_data/userfiles/files/86595834888.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b6a09e124---22470148252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=see+the+good+land+pdfPDF 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_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13982 10492 bytes
SHA-256: 107ea18b95a6a2e8d94c15095d11e18c7ae436a116fede7da34df79b7b3f5ad3
font_02_sfnt_off00015123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15123 18144 bytes
SHA-256: 555d8ab02765ae5fff3fe7d29a29d84838e36600e3b7b4f8371a0df0edd94650