Malicious PDF — malware analysis report

Static analysis result for SHA-256 b696004d0f39cae3…

MALICIOUS

PDF

109.4 KB Created: 2021-07-26 18:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4182ce1abd3940a970d11e42b2a1d251 SHA-1: 6ef2e9d8c1360268743f566cf8fe059e16f2ebce SHA-256: b696004d0f39cae31969e8e47ebf1f8168381d545a488d70b7a1763e4b3cf619
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a second-stage payload. The presence of a download button lure further supports this phishing-like workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/1nk8t0nkrqtlpanu054gga44iv/bujunukid.pdf In PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/bac86pdeft0tonhl68h8ci2kc6/bedujor.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c1cfab6b75223ae2f8b7a670cf0b6ff8/53801461430.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6d4b9bc6---botuxemeg.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3418b4bdf05479f3285b00baea94d003/gubexeligixuxe.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/wigagukowufimawumomojizo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fd05188d9ade1ea6e843c534425b4772/tekimewunimofuvunarumim.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/dokiba.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/98466005220.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/96874049780.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/48265557689.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/salidumepal.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/0b1da172060d1607cbeed6fa9a61bc0b/84203251890.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d231d28a861---12577260281.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/16609236234.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/86573358609.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/melewuliga.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/pakejumajopo.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/vasavosasarosa.pdfIn PDF document text
    • http://unseretochter.com/images/file/kizukurinodumogiwizukenor.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/jaden.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf4c72be1---97265893494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+fix+finding+peers+utorrentPDF 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_off00014735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14735 17764 bytes
SHA-256: 6525c3f8cfc98bf0355345e204a7a0ca7876f6afd6817dff44a64b0e0432114c
font_01_sfnt_off0001763a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1763A 10744 bytes
SHA-256: a29a655ec290727994d8fa4c724b6c887ee0d0678de5273c2d42360ca5a28d11
font_02_sfnt_off00018ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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