Malicious PDF — malware analysis report

Static analysis result for SHA-256 83283b6d6a5c105d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 10:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a880fca0a285ba21a6fe0d0e48750d0 SHA-1: 7f86e518d16951b7db63e43b925a2d4b68c3365c SHA-256: 83283b6d6a5c105dce4732aa98436aa3765a1b40a8512dfbdcdd57fa668cc65c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to potentially compromised WordPress sites and other disposable hosting, suggesting it's used for phishing or distributing further malware. The PDF structure itself does not contain readable content, but the presence of numerous external URIs and the detection results strongly suggest a malicious redirection or exploit attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://berbun.com/user_img/file/19217096956.pdf In PDF document text
    • https://tort-art.ru/userfiles/file/pinatifipijameso.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac49ea41bd---9745219233.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d470f10923c8853b9395eade8ec8cadd/34478770730.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a6c4c23a13083ca4be6a7a544325eb91/guxumevivemi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083faff9bd35---fobutepixadibe.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b545a77d9e80f6bb3aa864addda41dab/fomumelunik.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/jivofalixidaj.pdfIn PDF document text
    • http://thebaileyfamilyreunion.com/clients/6/6f/6f45d7e5c9279c15d0bd3a3fa6949618/File/32297977192.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/zatasujifaxijazenamos.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079448f1a860---zurojerurobegujepub.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078faf18a143---58101612425.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/85ahpjink8h13ub28p00mm6gs8/gevuzadepeme.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/12277974843.pdfIn PDF document text
    • https://doitoutdoorz.com/file/eotjJhKS2rX8GDal.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/95297855405.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/gasiselar.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0b7c1f484e0f02f2f2715dc5a6e723bb/85670835844.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/596cb8pkv0d9iib21mrbtmnfgt/38943378835.pdfIn PDF document text
    • http://malifer.hu/upload/file/koguxokodezurirovubewe.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87f704bb2---7376270752.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/nezuxi.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e46b03b9d07a78dcb85e7809a5b86d83/ligena.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/24406062202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=violet+evergarden+novela+completa+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_off0000cfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 10832 bytes
SHA-256: 09da268c41d134c8af213a595798b39de8af2877a51ab000eba9d92059e7a3cc
font_02_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 18804 bytes
SHA-256: 24c2cd62adfe3bcea3b1202de9afbb8c798d391895c4b428183c4ae4f499c0e8

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