Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b253f35119ef49…

MALICIOUS

PDF

92.2 KB Created: 2021-07-09 07:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2da9c0928dc30832258b1ecd248270d6 SHA-1: 6d0908ba52d13356eba24a9a94cb1c248975253c SHA-256: b7b253f35119ef49da75d6227197c83780bfe2483bb51ff10a2b006b8f2aac6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are confirmed benign, are part of a larger pattern of potentially harmful redirection.

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 http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813842c7df7---gefonamavetumefidabogadu.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d78f377a0eeb305c05f67f89c8e5a307/97345485097.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/27fb8e3f703696b1915b5ced09028dfd/samobadetuxu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ce66877c2---62520365710.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160998e2fb1ede---23711979400.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c1467988f---dizafo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61de126e0d---90992561200.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/59967501109.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/tujurixiji.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/utfh0fke1tvmpfq8p3laumd5e9/3264803449.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/74061083199.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210607_26036E439756053C.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/41098876111.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d67b8407fda---lebizofijenosi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae256bffae---72161290539.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ad99c4d86---depikijoravas.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/sssbdt3i83srq2htjkrjp15fgi/kikimejipupavosibukol.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/mowev.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/90328321219.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/nuwodejuzididitela.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/27268847946.pdfIn PDF document text
    • https://togeltop.net/contents//files/kofedujunaweva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=some+basic+concepts+of+chemistry+all+formulasPDF 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_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 17092 bytes
SHA-256: 2d154aef08112d8a3c9cca2a165da6d8f758298509828a4251cb2bff5233f211
font_02_sfnt_off00014994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14994 11176 bytes
SHA-256: f518c5813808fe87330b2d2f76fb891eb0cae37909efbc9370ac3e81e0083bc0

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