Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39e4827025ff284…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 07:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d37c69cda4dfd85e38225eee8a921d7 SHA-1: 541061665cea264def83a28edbf16e37a71afb26 SHA-256: f39e4827025ff28431caa4cd94143476ff006d2fb9ed48ba3895e4ae19370a2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://magnumprint.ru/upload/files/dabekidogufene.pdf In PDF document text
    • http://chamdure.com/DATA/files/84723401199.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/ragubetokafilodugeda.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8c4df291d---14341974760.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/vilezegagubowajivaba.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/b01mjitvp1h1e6j8ua2vkclebh/63437052178.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf185bc75---vowozajovejuwuvuxelori.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f616e11087---58051790137.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/ranufedinu.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/43575983113.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609caec21c9b4---ropabugisuwejujajisufeb.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nifaj.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/tubunikarixobol.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/80931934031.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/94453441024.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3185037f82---butovomubov.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646058089c---35321015948.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ooeeu2sksb2rvod9jho6s5qae3/fekenejidabiwimiwu.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d3fe237d2ba6822cd9a182d952c21536/moruworonomuz.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/23354241280.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/314093967.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/97724367624.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/nagisoxubegalolaxale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=2019+chevrolet+bolt+ev+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_off0000d0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F0 11160 bytes
SHA-256: 520fd252b46ef0260e0e761bc73891eddc9aabafa1566ef1baa60e4ba83b7c67
font_01_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 17392 bytes
SHA-256: e0a18003c6ac3765c11daf6baf0b105460a5e993ae717db4e89dd5c09a9d467c

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