Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05dd4ac70276d25…

MALICIOUS

PDF

84.9 KB Created: 2021-06-27 00:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d71dc060f12ee48227a383c008a6431b SHA-1: d817f4418a6df8b430ea3afeaddc32eb769e6071 SHA-256: b05dd4ac70276d25951729a3bedaa9a25d33d04981ba8fd6b194a79ba13efb42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of these links and the overall structure indicate an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bamfieldrental.com/userfiles/file/90305511620.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/396b5f49225e2f3fddfe1dd38dfebd46/47720888835.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080db389b976---48803278801.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ce14645971e---93144591226.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832b59664f---83530841534.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a3b2ff670b5091a006e133abe546fcdf/ridovubilezarefozitenubuj.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c444beabf0a---kadewizalebubidokofoso.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/bebigezesetilen.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f73eb4934---gumefinizenibirisejirove.pdf
    • http://babyindex.nl/images/uploads/businozegodipifikikex.pdf
    • http://imbirimbir.ru/files/75035921256.pdf
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/pugafesuzagow.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/57d95ee6e97d1af162898345baf7dc20/mavirakagatiguzan.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4455f8f786176c1b81825f1ce54c82ba/29025485855.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8621519440---88105735326.pdf
    • http://espacioschillout.es/images/admin/file/vipuzaluripodesadigew.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/79ouob7gnihomk89vfro3lq1nv/kasawenifajag.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608147176f3b3---21803641752.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bad051ac25a---15222863636.pdf
    • http://www.tekkoo.net/images/library/File/84756844094.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088c52eb4f4e---joxevokuperuveginizariwas.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608054553cd3f---12870599216.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f836b72b3---45387550583.pdf
    • http://pensjonatagat.pl/userfiles/file/84258906178.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+host+a+dedicated+ark+server+ps4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e966.bin
5736ad21297dd34206145948c583a6fd2f3818ad291278e8e7bb691b36addf1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 16728 bytes
font_01_sfnt_off000114f9.bin
81c4a3cdd84b20a266658a9399baf86e30ca889d3d538616d8f8244f9946577e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 10776 bytes
font_02_sfnt_off00012e08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E08 16792 bytes

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