Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cdbb3f5d59f853…

MALICIOUS

PDF

74.6 KB Created: 2021-07-19 15:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 74e1298f603a06960d1d2e90c388c42d SHA-1: 1775abdcecaa67a946cd977ab12b287ca13eb5f1 SHA-256: 40cdbb3f5d59f853d7fe5e585b5c5d998e34a83a2f45ef56e8bff9f209fe9ead
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://alakharia.com/public_html/userfiles/file/85599674094.pdf In PDF document text
    • https://agrilaui.com/userfiles/file/fawerumetigoxiduxu.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160839d3f208b3---tarubukosigobuxagorome.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/vekejabup.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/godelogilobadepa.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210430235330919372284.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/42788736514.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/19518251993.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe2eca04ab---sofeju.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b7595043e---90430454291.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/gidukabizalumatitawex.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/bupiguraxokiwevirixe.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/17132194558.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/q4q16mg5sqmc7ikhkass2uqq9t/52226278754.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/40fdf10b139fda6ca8cca12d54e99cce/rimugoj.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/fobafogedojanivofelisaf.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/vo8ve8eu3plltb082lg9gvekab/pubepinazox.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jmsmm0f3hc4i302om0pa1iegg4/tikazekunejulojepiwoxa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39d86a320---gorivejosupojibisegazel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848feac0d59---fejuxisufufoziduwidapox.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6ab11d06---56320788350.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/2805269268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+feature+of+your+manual+propelling+device+should+you+check+before+each+tripPDF 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_off0000bef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF4 11572 bytes
SHA-256: 44d964539f3cfe7509efd974637e8407eed2520d1a00c88f24e01ae80b707a17
font_01_sfnt_off0000d9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 16404 bytes
SHA-256: a004b087ee8b8f610c8b13d9cc99b934033ebe79d132a70508bfc3b9bc40c0d5
font_02_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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