Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6310ba50ce7e5d…

MALICIOUS

PDF

83.8 KB Created: 2021-06-26 17:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4e932324d41aa7f9a31e3148097be0b8 SHA-1: 08a2a5b2ce8571e01478e74fa901a94ab3bd648d SHA-256: 2e6310ba50ce7e5d3ed5b759d852ff531bce4fb5542c45d7aac73fdb6e88fb84
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malware. The presence of a URL with 'get+file+from+input+file+javascript' in its query parameters further suggests a mechanism for downloading or executing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9584cb45---jamili.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7ocol37te1d7dbbaulfpi3sps0/bidimudo.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/kufozilizivufadulobibul.pdfIn PDF document text
    • https://mfdesign.hu/files/file/30540740668.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/xoxakebofalokibunowepopaz.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/76890635986.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/girusifodep.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35ddce1c7---fuxosalibos.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b56319e18c5---zinedokuvegojub.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/1782486077.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/14366173747.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wilujabaganodanemeranilor.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/52858936339.pdfIn PDF document text
    • http://texmet.pl/userimages/file/11808252953.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb58e095e61---10018326267.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/a714jepenq5sdbd5im2ldjb8ae/fixetebegikut.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d501f45b944---nolukofijofoganepizuwu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4995604725---bazawowejato.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lk7aakgatageaum61re6f2sn00/68772389194.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27fee15647---50602620503.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sulixakamugaturelumomopi.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/13181776264.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/45432069257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=get+file+from+input+file+javascriptPDF 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_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 17500 bytes
SHA-256: 52135d198659354b2a63bce1efb696ccbea31bbc30d924a8a3f18f93231a4d7f
font_01_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 10976 bytes
SHA-256: 85a2ae0493d8026e6a0831ab7c7a24b54776d251f45dc90a551861eae7b73c9f
font_02_sfnt_off000129c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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