Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1125304ee91c848…

MALICIOUS

PDF

73.0 KB Created: 2021-10-03 10:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ca1347eb7dc03f555af22aef02a3812b SHA-1: 317d01465850e6c9cdcfdf9f7c5d24fbb1526472 SHA-256: b1125304ee91c848894a330747beb981c6ea4a02d315f59477c91b60b83a7e9b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
  • 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 http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b83334141e---55035799826.pdf In PDF document text
    • http://hflchw.com/upload/file/wutitavatasusuz.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/18486993565.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/vuvuxifufelixedimot.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16152e85238307---34739502077.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/43822972124.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210929_31F0D200D001F13D.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af45a9737d---gudiwejegive.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/tidivasefowepovevituzi.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/nafufepagilutekojixex.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/61495092540.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///nifipezakitesarap.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/kubajarofewajuxis.pdfIn PDF document text
    • https://guijek.com/userfiles/file/33783204992.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/kkgchhsl785vsqfvmnkg4hn175/30376470929.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/37953671772.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/pemidowonusogof.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6ed15f3ff703c80e09a57f673f842a5b/39056614305.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/sakifixuvosapef.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/molosawisokurinisafuj.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/44890656136.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/64738764804.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/nufawedepogasi.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/60032847256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=national+level+online+art+competition+2020PDF 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_off0000b5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A0 10652 bytes
SHA-256: 685dfac32fd1e78bb39f6d0e751b11fa085f819bd1f6bd9f815d78ffe6b650ba
font_01_sfnt_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 17736 bytes
SHA-256: ffacbdd8efb70166aa3073fc4ff86108a5b854dad0c8865490b64012c013749f
font_02_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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