Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4197bff1fca5b1…

MALICIOUS

PDF

91.5 KB Created: 2021-09-05 01:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fa88b11520935365edc09f0e47ec880 SHA-1: 903fbf02415f4fd07afb4821d38dd047c8bc3bda SHA-256: 0f4197bff1fca5b1393ecffc9d140185f68ca3154a28f04aa59c31712b827eaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5196b9dee---66231873136.pdf In PDF document text
    • https://x-software.cz/data/file/jizoruti.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa824acc633---95501946775.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/feguresizedilatagepimimo.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/94173314253.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/84801374763.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/16b317579f1b4b55c6761b244a9da5b3/28553237334.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/mspunr3ssr2g2u93t76ahh7b5o/wukunefizefilaziligefe.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/64622003381.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4abc0faa5b4f04a3cbaea57b99307f16/kegadobisubisiwol.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8fese5p3l3ulqr0e4g93bq1tf5/26259679048.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/71018596467.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/26025779813.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/badafowuxuraxigovuj.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/55292366331.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/rejova.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad01956c823---pefimizesolopezi.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/15174839791.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/sefafegipunalese.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/14039056690.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/giwarowigujemegupiz.pdfIn PDF document text
    • https://iohrp.org/f_files/files/gelenonavubuzojosu.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/vuginixinofumumat.pdfIn PDF document text
    • http://innotack.com/userfiles/files/29594415562.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/sakotuveda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=2019+nissan+maxima+sv+owners+manualPDF 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_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 10888 bytes
SHA-256: 5ba3d77a749ee2706d59cb11476575966f123637320ebc7886b31eeed0f947db
font_01_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 17672 bytes
SHA-256: 78e70f9e23d4ddefc57b4af03f14f127c3c15408be20b9f87b88bc965fe15b4f
font_02_sfnt_off0001479f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1