Malicious PDF — malware analysis report

Static analysis result for SHA-256 da75a6128391d4a8…

MALICIOUS

PDF

74.8 KB Created: 2021-09-26 07:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c091163548d3f0f7ded399e75ccba556 SHA-1: 1b09f0848dd5e278c773dd9e8cfb97461b948c76 SHA-256: da75a6128391d4a8c0455fd82f6aadfbc8f441d49409332c6a793bc6ed83c80f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=insta+auto+liker+online PDF link annotation
    • http://sevennews.com.br/ckfinder/userfiles/files/nirasowiluladisom.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/78339111802.pdfIn PDF document text
    • https://onecre.com/images/content/files/48382407292.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/63921201043.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/6749317109.pdfIn PDF document text
    • https://coevent.ru/upload/files/fiwavofazude.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/96484000699.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/jalapamoboga.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/kuminijefapexirovatebin.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/xokitixejutupix.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/62099736896.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/jetumupupezodonimezin.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/wabiza.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2c902e10---33663162667.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9e8c751266bc8a9a379579f741166346/18310334775.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614eeca64cdff---tusilujirulatarokikotiwif.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/rijoletidit.pdfIn PDF document text
    • https://trainova.com/userfiles/file/texilisomelasof.pdfIn PDF document text
    • http://pedraferro.com/files/files/kejafewamakezorobapaxis.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/jibigu.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/fexovov.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/dapab.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/18144226749.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/piwurajaduvos.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_off0000c0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 17784 bytes
SHA-256: 9f8841bee483813a56b13005060059e98211eb465f22919110c7bab31c59e570
font_02_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 10244 bytes
SHA-256: b9983298cd98fcacf7b72ef3c0296a3a91cf9bbef17669196b078c0671659062