Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbeb696702736be…

MALICIOUS

PDF

70.6 KB Created: 2021-09-14 08:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e8803187313ce0278ede415f1cf0072 SHA-1: d7aa69353033ca0ea234a3abf31c7453e92b5a01 SHA-256: fdbeb696702736beb940c59371a258a7c4f11e8bd7d7e6d9cea6dea422270a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan distribution. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs, such as 'https://medvor.ru/uplcv?utm_term=download+play+store+iphone+6', are designed to lure users with deceptive search terms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=download+play+store+iphone+6 PDF link annotation
    • https://tractorpulling-emmeloord.nl/upload/file/depodoruf.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/9907588586.pdfIn PDF document text
    • https://pratham.one/file/lirefevir.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/50748451561.pdfIn PDF document text
    • https://forssh.com/userfiles/file/zetipodesizejuvenosive.pdfIn PDF document text
    • https://landi-bg.com/images/file/texotagapesamovukiti.pdfIn PDF document text
    • http://boxethai38.com/upload/file/gejumixisopifatexufam.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/13f7bfb001b2d4606044cbd1ac426c7c/wurejasefevirofixu.pdfIn PDF document text
    • https://digireg.si/upload/tujasapiwepizolame.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/doromexe.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/21301521587.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613879434ef17---funifigiwisimigax.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/21137260636.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78424c365---47678199124.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/daroberavavuxofutal.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/5684914098.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/nujobesot.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/bujijevesa.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/34075422282.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/ketiminugovizedemuzadexo.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/xetozolivevexe.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161347f2bb9d5c---13834842158.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_off0000b255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 15960 bytes
SHA-256: f9f539c1bcaf37be90a0a795a7e8eb405ee61355189df785b3840b86c24b85e5
font_02_sfnt_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 10860 bytes
SHA-256: 0bafd6278d142bf17b1a2515ab0bcc1b6591d9327806bbd9859ff873bbadce07