Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7b50eda2c9510c…

MALICIOUS

PDF

76.9 KB Created: 2021-07-13 13:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9a024bdb7102985123cad385d48362ca SHA-1: 4580bd3e8d394870c245a825195b624645e23e02 SHA-256: 9b7b50eda2c9510c3e728fa89de5fcced27f3bf41b4c282770ce2c89d79064bd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. ClamAV detection and ML classification further support its malicious nature. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • 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.
  • 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://chatsystem.site/js/ckfinder/userfiles/files/39342703597.pdf In PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0914877c6dc5af291840f0e3b0014755/59339346797.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070805445197.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/96922678236.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7aa6ea4f3---49496927194.pdfIn PDF document text
    • https://luminex.pl/upload/file/piwarifufom.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a35b9324---60420882378.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a7807d36e4a46619f7bb24a0a839426b/27947030243.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/50ad170a1851abfab556e1bb21440d65/zusalatuzumuminej.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/022637d408c55f63c69272e4437a20b0/zunotegiluret.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tukanejuwolabifonuvito.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/nevuwoduxije.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12dc1e152f---piruwubiripodilonurejo.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/61290440643.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4435ee70a---73931385267.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ddd0388e86a117f60d27631b40a8842d/11930858489.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2ed327f7c6f7ed0f1f20571fc442bf34/mikadezedag.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/begovigumujukerag.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210705185739_sw0r0b.pdfIn PDF document text
    • http://www.asslar.de/downloads/64955348896.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090081c0d43f---wogibujeluvikisomozol.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/fusigulegejujemin.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9463d68dc0---pewivebovozazokazozijaj.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/77502604893.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/59495321a960c477d998af1db12008d1/pututuvokizegakabepupap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sample+paper+of+english+class+12+with+solutionPDF 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_off0000c628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC628 16748 bytes
SHA-256: 6587e1a3433928553ae582af409fc24e7a7efb47594e0d5b302a096f06d3e201
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 11360 bytes
SHA-256: f029c5f7a436014b78ceb947beb785fcf27cb29a15635b9a6c86c751d13e0b6f
font_02_sfnt_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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