Malicious PDF — malware analysis report

Static analysis result for SHA-256 b410acd229ec9d7b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 18:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7a0976b130e1f5e5a2d40da4f7cdd37 SHA-1: 04702631fde6f412fc9274d7aaf249910b61c4f7 SHA-256: b410acd229ec9d7b875f1738a7cc1cc4612dc717cc3e204053e73a64eb30f8b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs is a primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=time+complexity+of+sorting+algorithms+pdf PDF link annotation
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5146868469681c150852b9ceaa164461/xudemeximas.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/lenizokigakudirogaxob.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ac9435a874289ea1ebd7b8069fda7b48/4624019377.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/68474485652.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/drr7et6r8to9k0qi5fih24o0fg/21271845656.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/95616967417.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/bivuxezutib.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106e67d61030---zimeneji.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/jixovibole.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202108260601177917.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05cea48edf---69577156679.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/15882818430.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b2rtnbm9q9u4um7r0nuds9slu0/wivipunegopukajiled.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1c792e86d3aef5d7e6330385ae6448dd/78320654263.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/wuposijiziz.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/ruzefilukugaduvosefiza.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/16138316985.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/14766767359.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2aaaf296---86979579612.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/jobuwib.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c073a625cfc---91711478835.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc8ba26aac---32685602612.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740a9a6dcd2---lajawivoraromo.pdfIn PDF document text
    • 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_off0000e27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 18164 bytes
SHA-256: 04ed50773f48da0293b28b0875dd2d5424499af5925bebabd39f5ee8800c5056
font_02_sfnt_off000129e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 11244 bytes
SHA-256: 093e58d371d0a72644b250e3baf9c8cecd032bd610991171d098ea1176dc96ca

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