Malicious PDF — malware analysis report

Static analysis result for SHA-256 a249d4bea2abc05b…

MALICIOUS

PDF

94.3 KB Created: 2021-06-25 23:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26b4e1da7442ab50c4e245fc759c3136 SHA-1: dab9eeba48600129cf54410d0feba6fa24762ab7 SHA-256: a249d4bea2abc05bbcbfc0044662d0d0d57f8e4885658e9441da0f9d3569dbd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://m-isc.com/userfiles/file/vomivomo.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607f88041523b---foweruraxasibenenetefif.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/5a26009c262401f756c3b6616a23a24e/kibozeno.pdf
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/doripade.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d5f65802560887492045a8f459dce141/74230148017.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075224c72b59---merafoxivase.pdf
    • https://advantagelic.com/singhania/downloads/file/pojuxunalijekopef.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6cd35276e6a86cda21ddc4c5a288b1c3/38670878096.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/fd07a1d681d626b39c17536fcb331164/tajumokupexofo.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160721636372f0---30948636717.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a540c4eef82---fagarij.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed52cc8202---38623411456.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/kezorodo.pdf
    • https://vieclamday.com/userfiles/file/dobusebanomurogod.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/698dcvfjb47q8j8corg70h3c9s/wixusamegadegerukaladuzak.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/jguint111al7logm85pjjori9p/mujisoratoramunex.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b143a916a93---fujewesukuzabema.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160999c6e81cb4---79750904342.pdf
    • https://vresponse.net/userfiles/file/pameraxe.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bbe1496e2---wijoxalujivubevoze.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/v3l6bi8jkd578t76cud3v58fmb/21868593186.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mqlak3c6tcr4eegbfmfb9riku1/24874194471.pdf
    • http://medica-eg.com/userfiles/file/foropuw.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5ca98a12---limuxojuzajuje.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=dbms+question+bank+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b76.bin
a2b855959a60347e805cd0b2e8293428c0c2f89af152b1a3c0630f65ae5c33e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 17992 bytes
font_01_sfnt_off00013ade.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADE 16792 bytes
font_02_sfnt_off000152f5.bin
adca4c71918a83e9fa0ee093ba009b2189827da8f345447701d8c015fc9c8a59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152F5 10892 bytes

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