Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae8a039e844c039…

MALICIOUS

PDF

77.6 KB Created: 2021-08-26 08:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95770c86dc4c19d4812314f8ad597394 SHA-1: bbdc2c6a56d6ced55d55113ec1b312cfcb1b4455 SHA-256: cae8a039e844c0393180e494c5338bcffb9ad5f2f40270cd12cf9516357fa7f4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and disposable domains. These links are likely used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://aprenda-atdi.com/uploads/files/95769086766.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qgktc0m82lcgucbpkd671uv355/44713535245.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/melelutuxunovujatigipilox.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/64236667278.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/wubinifu.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/83632536199.pdfIn PDF document text
    • https://4appsoftware.it/file/43265924438.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbb8cca69---dinudus.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/da21e75905e71aebdf934cd0077357ed/tudapor.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rmnbtji9e4uv1i7mo29jdob9o2/kumonarujomumirovub.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/38507454709.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83c217174---36361060908.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef2de414bc---vagosijuvadawepefeniru.pdfIn PDF document text
    • https://castel.ro/userfiles/file/6734308395.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c929405ea---99120351353.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/42173102314.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60a161a17---nivikonuti.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edeca8bd735---japipeluluvof.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ad6c853fbe4b74e2b58ba3945a515cc0/13412099131.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/lerikisoxefowovemi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f0c6af298---2318838750.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b81efc53dbd---93123513560.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210523035048.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/mazedamoraziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tea+and+rumPDF 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_off0000cfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 16392 bytes
SHA-256: eb2e705d89efa8ce2909a35a32a9cf1b19050f8fda4b2fb2e1739c60f42a70dd
font_01_sfnt_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 9948 bytes
SHA-256: d844cba5075c3a633627548470265a98fa2ad4cb5a7ca026ec607beb2388abad
font_02_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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