Malicious PDF — malware analysis report

Static analysis result for SHA-256 1754e03f6dc73161…

MALICIOUS

PDF

85.5 KB Created: 2021-08-14 19:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e71174ae994fc052f3aab364d85b2eba SHA-1: a1d723a55ca8946057e09d36f3c90c9d0ac47f5e SHA-256: 1754e03f6dc73161349b3ca750980d0819671c1f3eab85c53a74dbe4c2ce723a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely to lure users into downloading further malware or engaging in phishing activities. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/676bf91d8252ffbaa8e0a57005dddef3/16598521739.pdf In PDF document text
    • http://thingsantiquesla.com/userfiles/files/23961556686.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfca797ce2---fejililikot.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/91202199498.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a60475b369c455be45ab061ab56a96a2/daduxuvuv.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/39313503165.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/watofaxisi.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/17763382600.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/xusakevafafo.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e9cdb19b9e8bfd9bcf537f2097e68fbf/fisidojokuxalokabiwexinid.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/rinodojupaburevujasat.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8e66b41af0e4a38101e841d2c1d760d7/kosutawaminelozujawafofe.pdfIn PDF document text
    • http://consade.com/userfiles/file/2985832120.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/xolofenetijudiz.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-5/20210705181635118897.pdfIn PDF document text
    • http://superbarter.sk/media/file/44982725758.pdfIn PDF document text
    • https://kopari.hu/files/file/nivukujiguvap.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/74452c9a3b0aea422137bc6c6f6aa1fc/xadakeb.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/82728142330.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/16777001257.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/58346094950.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/vimofukofoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=math+textbook+grade+6+nelsonPDF 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_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 10932 bytes
SHA-256: 7b8fe82c5a65e0d7aa17f68d7f3f790e732404cca814c1dc5c7d18bfb1fbf504
font_02_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 16464 bytes
SHA-256: f05bb3bce17260089535e734d232153eb1a43708332fa08517122a593fd14e66

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