Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccb87bdd7b47abe…

MALICIOUS

PDF

85.6 KB Created: 2021-08-10 23:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ecaaceeaa75b70cd2f450e6bbcf5a94 SHA-1: f75cbe33694b159c623fba566d0007e350714cb0 SHA-256: fccb87bdd7b47abe9d77276bff3bae1b61841f312b8b7d39df7a720aaa7eca7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=que+significa+sentido+literario PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4jv8nn01fpuuhsl05h68je4tk7/24302144203.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a881e9a93db---13800169775.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/buxoxaxod.pdfIn PDF document text
    • http://51www.org/uploadfile/file/dc5d89c23136e8e892005165b3d51f2f.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608f93125f093---17767527013.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8rcm8hfi2mu0f12c9unqgkh7c2/duruzutipiluxaxodagalubi.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1e24bb60ba5383c659a078f75e0053b6/23397247391.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/gafokofotezu.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2059f12bf---65521397907.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/70528637686.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/5815848029.pdfIn PDF document text
    • https://energooptima.hu/upload/File/55569664039.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/tugapirepurevubabu.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/nivivajifodebiv.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d315807e3---17390944924.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/81997150035.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f41e6de87---zosuve.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/nuwiloguse.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160761b4034b7f---fimafabarebarudu.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/14519308514.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/maworesagorixefiseporu.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/65992168958.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/nptsr60giudrcb7mjcb4nj4cjr/juziripoximanatarezijelo.pdfIn PDF document text
    • http://rsst77.ru/upload/files/vamukaw.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/puvaridimujalabod.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_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 10808 bytes
SHA-256: c0280f7e8accc84f264abe3138c225beca0ccfb792ea3b3698c01b0dcfcf738e
font_02_sfnt_off000118a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A4 19052 bytes
SHA-256: 895f154a5ce34d4dcb1b30e202350b69396f6e1e8d7dfa2816e926987f6a2b9e

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