Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbfb3b5dd39bd2e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-10 05:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1515511c2df902c5e44b58cfa2a12a3d SHA-1: a1d5f1306c912dc3e5bb985c6e568031bbbde088 SHA-256: 7dbfb3b5dd39bd2ea01a50ea8c5a7d0213354d410eb8f5faf1d728da4a18af93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress sites and disposable hosting, indicating an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the execution of JavaScript to download further payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://josquin-capella.de/download/mexoragafofadivufomus.pdf In PDF document text
    • http://kalmi.ru/upfiles/files/wojawoxubosejazud.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/94017282566.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/lotegusinurekojumos.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/65dd8b171806b3f3031c58db4850514d/toribunetixakix.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/78841932791.pdfIn PDF document text
    • http://riversedgefm.com/files/file/kozisozesijakosakejurufu.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/30583224095.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374565f2c61---xivojijivazitomupigita.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/47553939699.pdfIn PDF document text
    • http://workontext.ru/media/file/11564160598.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/99280485261.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf93cdda6---letapipor.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/06f1a7c5a0224c2f712605741dbde252/24515900994.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/soriwab.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/24603140735.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/66838555068.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210903_3D368C79CCA92829.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/vosoluvej.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/36486684290.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/1986939103.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/zanunenogevezudewabi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c168e655---sunisod.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613426cea3f05---65476684944.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210910_0FC943C228ABC28A.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/badisirezejosebaxitukeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rigveda+english+pdfPDF 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_off0000bca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA9 10568 bytes
SHA-256: 5c4dfcc62ecb9edea84517f3327f380f75d393fb14891d4939d26ad3f4b78b75
font_01_sfnt_off0000d477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 18236 bytes
SHA-256: 5544acd4a70e01af58990d0e58cd956505f10725eee624d7c6f797339bd11210

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