Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a9ce55656894dc…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 08:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c88e79e44f58582a838485f2dff32167 SHA-1: 8dbfd315c25fcf7cc77deaae39476d69a3d1778d SHA-256: 92a9ce55656894dc11f58142571bc0c1b2a87becebba0f9ecbf540a14ccbf2e1
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised websites, likely intended to host malicious payloads or phishing 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 0.9974

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 http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d720be87---bexudelajavibarobolitefi.pdf In PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4e7bd211---lefotatikawurufurinolotap.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/38148807881.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210916161008_347948.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/90266913526.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/watukedidepujafetu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bf500c806c2e9557d24e1bada83dc80/96029038657.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f4738b89f3d92390a30f5dd61c016692/68022420887.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a7718f289c19e7942e6f78ae6985ac46/sasepaxewitopijola.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161401d6cb161e---zupanujorakekowetege.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/puwebiru.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/68983701507.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/nexotawosikavugi.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/nupogotuxid.pdfIn PDF document text
    • http://dalaichau.com/files/72673979227.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/54921603939.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/59507674489.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/26976875982.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/28285108366.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/34600827367.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4b04fc263c69191d0c348d76d3507864/misinejofixavefutizaze.pdfIn PDF document text
    • https://dafelia.com/files/ginigadexubupanepeworad.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/27133257908.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456d01362bb---vivadimapusenovaser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=3d+anatomy+atlas+apkPDF 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_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 10512 bytes
SHA-256: 28ad28cee292a1b00283ba75c2cdf48d754d8302399f83b0516368e75eb47d04
font_01_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 18208 bytes
SHA-256: 4a3c5d2d9c121e18ac509550df5ab9c5a5dbda91de31cb60f27bf23d801dd7e7

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