Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd058b8f498d15d2…

MALICIOUS

PDF

94.4 KB Created: 2021-07-06 07:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b67e8b403d9809a27fd26ae1e0547e79 SHA-1: c66544944d33360822c31e51b61eac5e1f5596a9 SHA-256: bd058b8f498d15d274adce7756fce97f233e9239b84498e651d85e13d435024f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload via these links. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb642713e---73942069413.pdf
    • http://euroteam.vn/ckfinder/userfiles//files/fisunoxilosa.pdf
    • http://lindseyderence.com/userfiles/files/mugawizevorewafelofulot.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/77016302203.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a169f567df4---telegogotugipexuzares.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/guziwepapupimusib.pdf
    • https://communeouchamps.fr/userfiles/file/44339067942.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a0f8eff47563a19e2d7b393847509303/5409317690.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a323769d0---jisinavikanesarukurele.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/got8ch9gehhlbuuc1cv7pvf66q/25505192524.pdf
    • https://alate.org/admin/fckeditor/editorfile/pasasedenekoxage.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac83c139971---xomiwusifepivij.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b9379826b---pujejikosawagaregegef.pdf
    • http://liyangah.com/Upload/file/37864054354.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b00302e88c2---10334200789.pdf
    • http://www.anclupnapoli.it/userfiles/file/pojigekaruw.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32fa789f7---xakanakemeg.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/60375754058.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/d7c99c9ab22a21e4bab925998c52e380/21355888801.pdf
    • http://altelaw.com/uploads/image/file/39855744137.pdf
    • https://master-service.ro/images/file/96516947951.pdf
    • http://smn68.com/clients/75339/File/36919082437.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/14042a67e02de35b1ca808178f4f9a83/juwupi.pdf
    • https://peiitw.com/Upload/ckeditor/files/satemevozubif.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609886373525b---fetuxesojo.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e18913b441---lebiretanuwek.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073379e1e868---16159415674.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mike+and+doll+fnaf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010672.bin
668beef521be4fa1b4da676305976ef5dfb01e754aef5f9258e056fa92b2b5ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 1888 bytes
font_01_sfnt_off00010f32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 16792 bytes
font_02_sfnt_off00012744.bin
0b0ce0e56e235b23bdea4c8e1b93ef74eeb74814cf671d119cbc35d8e071f1dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 17704 bytes
font_03_sfnt_off0001558f.bin
8ef5bc2d0f8110acf59bdf7d10231587e01af6e6f5ec8dbd243c27acb81c2964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1558F 10068 bytes

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