Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4de1b1fd676c414…

MALICIOUS

PDF

107.5 KB Created: 2021-08-13 10:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60a1fa518ee0e646c45f3eb678fd98ae SHA-1: 894614ece093b11e98f5b30cc85989444dca4b4a SHA-256: f4de1b1fd676c4140a6bfdead9cb8336d29f1128e7370125c3d401b58b3f7f24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external links, many hosted on potentially compromised CMS platforms, is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607830d8a36bc---kureparejiteruverudupe.pdf In PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775f6ae02d8---77535622309.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lstm6202kv90ars3n7c1va27t4/55765029499.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c2553c421956c6ce7798e7d74c7a67aa/25617981521.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/40d3901dcc69d364cad53f0648765443/wulixejibenafirurujomexi.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/40137233382.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/83344048706.pdfIn PDF document text
    • http://www.heatandgas.com//EditorImages/file/41117446376.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/8530740462.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/tarozuvovamowadazofuki.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/mvqmgh6v0vp0ku59is8jbkl2gu/kijefamake.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/zujuvirasekodevemi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eead1c1e4---sebexofav.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/76ce688009661fcc903ad1d5f72d525a/kusof.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf12b1c7b5---sulase.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16115d2eb09d2e---gegigobozasunu.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/97135293632.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e9c9b9ba8d5b04bf3d60cbb5dc5cb374/27318882370.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2eb9665fcd3de608f5e1176eb883d9a6/8490071413.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5743f069aaf637cacc8d62f742698908/wugulusurojatuzugag.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097fa5439132---32113169455.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/26492027506.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161110d138fe6d---65787556896.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/lasimorubimufuxibeg.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/48628785033.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/55d7fcd607a56b0abcd9e91daf3d2aa9/61201404366.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70ce004163---dofomozud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+popcorn+time+on+androidPDF 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_off00013b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15360 20156 bytes
SHA-256: 4f6156106a3e3d05c0300aa6b7a9b910ffe33d967b6b62f27fab021ecef363d1
font_02_sfnt_off00018676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18676 10720 bytes
SHA-256: f2f4569ed855a4c93b09ff5fcfe7fdf4043a9a89582ded198b9bb02b16ee5e74

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