Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd481413e201cbf…

MALICIOUS

PDF

98.3 KB Created: 2021-09-02 04:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 751229ce74ce804a55b4b349e55d837d SHA-1: 048a41dbabc323c12d38211d017a72effda2f1fe SHA-256: bdd481413e201cbfaf6c048316327712c2e371de0f71b50946eb96982b1b3c8e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://laborke.ru/uplcv?utm_term=afro+low+taper PDF link annotation
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2af2d643657d718375f0c912dd2722d1/rotojoraxafasifupelejonu.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/18363833485.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6a97857c1---zapavato.pdfIn PDF document text
    • http://beateromer.com/bilder/file/22989350450.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/kotibiludatusifafibuwotum.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ndbmh8f896mbkg3kl9jvpepikm/57931314196.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7af346158---70040799904.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/13338914767.pdfIn PDF document text
    • http://recviem.ru/img/upload/29297023899.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946dffc09b1---gebewutozazonaxisiwe.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161196f0b1bce5---22607932981.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/zutukemev.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/42791814721.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/rofixinepawaxujaje.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/besigopixefenunef.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/b26p69t2q6pb0ahgjnbs10p133/kakabowuvi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095118c805f6---bolitodejaladiriwe.pdfIn PDF document text
    • http://alkanboya.com/files/file///zudatobusig.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/27146328233.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/30927163428.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608908dce8d73---90631218991.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c3a260d8484678626b1a8ccd9eab9499/71957247631.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd452d38e74---87873313337.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_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 17924 bytes
SHA-256: d59dafcc98cbf4086603d836086f6c2acb5d5888aabac8c0a7d1ad90c5d1328f
font_01_sfnt_off00014d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16520 10056 bytes
SHA-256: 04fdde757a656afa2c7282055bee77541204952f4f1061b40a3394e40c0f8001

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