Malicious PDF — malware analysis report

Static analysis result for SHA-256 75462b6e829f70ed…

MALICIOUS

PDF

101.5 KB Created: 2021-10-05 06:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 007247efe41119aba3a0d91baf1d0c32 SHA-1: 6a999ddc62ce037da9447f59da18f831b6f0b60d SHA-256: 75462b6e829f70ed1b68f7d94862bb46bdb4938fac6ed4afeec27060614a0e06
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://stmpallet.com/ckfinder/userfiles/files/rozapuritetomuboz.pdf In PDF document text
    • http://www.s4b.nl/upload/files/xuxurubewujitavowe.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/kobowefepenonakeruxevep.pdfIn PDF document text
    • https://databaze-zdarma.cz/userfiles/files/41408658595.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/lezupezimamasujujis.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/22584223194.pdfIn PDF document text
    • https://zzhqhi.com/d/files/2742061551.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/20826781908.pdfIn PDF document text
    • https://festacontinua.it/public/file/wukijonoziromum.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/39828189318.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/kosekobisodewudaxaxeluma.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/lh54p9t6rvi1dieg5u98m56a10/98054546644.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20211004203257.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/xurilowel.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/netubumalokubigigopab.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090304573273499.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/10t5c207g221de5if41aoiof44/zegefafo.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/bikuta.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/83746466735.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/venupobizamus.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/nusigezewusekivibirota.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/7126952925.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/516af8ee40b8e47b3f4d288aa164810c/dorurap.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/19510079975.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/magifijiletatasukoz.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613625e314f2b---5489607927.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/36093530844.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/gokujuvupowopipiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+foundation+isaac+asimov+pdfPDF 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_off000126d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D8 18800 bytes
SHA-256: 928f07a7685ff025e09736608e4af0cf10ac91c3280c2e8676da3c7f452e83aa
font_01_sfnt_off000156c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED9 10868 bytes
SHA-256: 85e43f5d2a379373c4e17a77d2be8b11433243604200b17f5ed2682f6438bfee