Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d00c4239b9753f2…

MALICIOUS

PDF

87.1 KB Created: 2021-06-25 21:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c768401ba982603a384de57efc1e4f26 SHA-1: 48f0c22553f57323026514570a99aa2fef3f5d30 SHA-256: 5d00c4239b9753f27f7e65c034ea1489d7b3b57309447454b2d57c42e6bb7fc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are hosted on compromised CMS uploads. The document's structure and the presence of numerous external links suggest an attempt to direct users to malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e7tm5qm98vgbri2v652ebdlnn6/gosunomezeniwa.pdf In PDF document text
    • http://energo-market.ru/sadm_files/lepekagitakoxofelidununif.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077272b46d5a---folukukokexemudelife.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/wunimuziv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b13fb695f2---tipizamepodolibetetov.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5ntljac7saulenaspmg6hsmqm6/46061597848.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/6a1fefaa862e0e590b54d711ea39a00a/fufewinoxifo.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/35886333697.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/sf92q6b6j5c90ej1sveapc1351/7983499376.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875be8670f1---48618454000.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/411fccc68ac1386a9363821b11910fa1/xufakikagodipolekekago.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/52200508381.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/7475a1fd22631307b5276358e1a08107/tanixitukebonusupanur.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/e86063298bd13b23f69818cb64184cef/lizekulededesepagutobef.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a27df05dc20---55283324827.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2e9dc8005cbd5951277cd2e2a138cabb/vobopajusenisados.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/02654ea52a80ba12ab8e55c5133b583c/39188657559.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7c97eedbe67cca0fe61039a618dabe13/jusuzelebifodezozu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6bc89b615---vibivowulawujebu.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/bavinegajatitenokuvi.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071b2f252abe---roposurabafivawegijozo.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/tutogal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=miley+cyrus+as+mainframePDF 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_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 17512 bytes
SHA-256: 79c6c1ad96af2e0b9a50fed69ad318f118cd80b36f47fc37d148050d11fc39d8
font_01_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 10484 bytes
SHA-256: 1966f6a2bde04ff03a8ddb3f70cdadbf5ca48e7266c2ed533eb72cf169a4d8fa
font_02_sfnt_off0001373b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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