Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58228eb2659f230…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 09:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c005e1e50d37552117c0d4549c4dfa72 SHA-1: 607f4527ecfefb54969972adb962b330a66c3346 SHA-256: f58228eb2659f23034f810acaf6bb40099d405bb838730e9ce241089c7d9e09f
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm with numerous URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of these links and the heuristic firings strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://equator-maritime.com/userfiles/file/xekaxag.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/d52qkc8ge5a91g2jn681lpsjfu/20004396181.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jjpe8o28enqlqrql6lr2cf4f54/59990140336.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/vonejelasavejinul.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/iu93pru91f9nrcrt4p24o7fon0/ludalativ.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/4de5b5d81dd4d80b11766d1c04bd9646/12181337991.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/54716370974.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/jonanujames.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1db70004c1c4803e789203ee4c20d70f/velefakita.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6ed0da66031fd3f9baadd24ec3e0cadd/vogejexawedirurupa.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/paseg.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a948406555a---domegafolatitofi.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/29511270473.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/peripojat.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160982b2410ed3---14373207730.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/dbaatebo1lkb3cvbnnr2qrrpnc/3200439974.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf4f25f162---23783480122.pdfIn PDF document text
    • http://adice-area.com/pictures/files/34975899856.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/51527379030.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/42276614412.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/fafifenomupexaxozusitik.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ntkch9940pqhop0vnh1fd5eieu/45811808235.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/57006372365.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609164a9e7699---80011924728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=1000+indian+rupees+to+usdPDF 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_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 19344 bytes
SHA-256: 568a57fc9045b557e9a087109efe6da40f03f13fb8d3ddade15025501d7d6400
font_02_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 10516 bytes
SHA-256: 0de28d08c4e66b04077d0332796d142bcf722ded27d792b3b929a7fb6c1455a6

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