Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fe838e4bca91ab…

MALICIOUS

PDF

95.1 KB Created: 2021-08-01 17:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 983c3f4860bbf8d9eec49e6b87987aa1 SHA-1: 726d94969095d1160055d1f1c3011921a065742c SHA-256: d4fe838e4bca91ab33bf3d5182778ce0df7d47171342f2f20347348a8a39d19a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites hosting further PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phishing content. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/el4ml1gafmo901kbmaaels83lb/45609161418.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0c83ad8d02f431773048a77e67434e40/31992093328.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/karagizegun.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d00ab8fe56086aeb86f91b8f46f50be/lumol.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/36280735529.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836065e3208---tikokigezopamin.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/raxezetijot.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a3def8de---xorarazagobeligadowidesi.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/b45f820c471940832d60d47eb487564c/soxezabulo.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/25915732466.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/taraziredazefi.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/99030724076.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2105310019513978388odroz.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8daaf99e6a---fanizilawexusosowizidaxop.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cc5eb4318---31261495510.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/d68499c8064420f3294f3245af54eee2/tamowuxaxoliwede.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/gotap.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l9lgcj2rjj1m8gg7dssas34vf0/38832855493.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/wevisejenelaralajoleto.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/vutoxedirobiw.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aba069162---99491230720.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/rk9mksdpbs5g4sqi2nbco4ac72/wipizudofevalinenigejada.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/19eaefe72250f6d9cf17e8fe46be2f3b/xagulanugufenewekufunuw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/oh7vrhvqt7jlkf9umt4eds2ph4/puwijepejosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=does+kaiser+have+rapid+covid+testingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 10908 bytes
SHA-256: 713a426fad7dd4526e4de90d75e3e1360b162b89fcd1811487b1daf4b5ee76ec
font_01_sfnt_off00012905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12905 17320 bytes
SHA-256: f0b02edd8291be58d534f38f5b9b5fbecca39b0df3f17b1ac6514d54724fb3ce
font_02_sfnt_off00015665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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