Malicious PDF — malware analysis report

Static analysis result for SHA-256 e631374a2a666252…

MALICIOUS

PDF

90.4 KB Created: 2021-09-01 12:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 803cf8c7fcd9a569946c3b127b4ca0e0 SHA-1: 3a3d81913b8e1d89b9e32be33238b9ab75250cb8 SHA-256: e631374a2a666252aa33298db6bbcf63380f1084cc9987f94c740f42b7135c3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites and disposable hosting, indicating an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • 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://urbanconstructions.org/images/uploadedimages/file/sekolexezopijewawe.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7822e34a---33585995317.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6034a5104---8745598024.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/gunexejusekusagigaduxe.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/50464274397.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/65313236694.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078efe7c5bfa---baforuwugexukuruvupemafe.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afba09ca1fc---82655867492.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ca963a48ba95020fd44a6bf6d4f24db1/98760273749.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/51547131424.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/t7r6p3nfuf5gcg9g3h27bmafll/juboluxunomav.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/uqsc8lrgqrsovl14ki6s72ruo7/pebirajegogebufag.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/mv51hdn9nto5arr7vrtchpbdob/76088755131.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/vupifudesekifusebesapiges.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fewitukarisufeni.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/79515075723.pdfIn PDF document text
    • http://iwishop.hu/file/lirukenivibakoxubadinofi.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/sebepedisibojakirapumax.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace0db1634f---4189891055.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/37766773091.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/tosolulu.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/10212637477.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jcirvvf7jm834cu8b86d5rs523/17169471975.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///64963870029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hydroelectric+power+isPDF 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_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 19920 bytes
SHA-256: 8e61a701d8832b657a65a13cdbba3ef705bc83aaa85d2e0ff04cafa0c83adc49
font_02_sfnt_off0001431d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431D 10432 bytes
SHA-256: 8ae9edc3179a8d5894a4c0c1d1585c385eef69d466e089f04adf97069facfb3c

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