Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42e8cbd1d70d3d6…

MALICIOUS

PDF

85.8 KB Created: 2021-07-25 19:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c271ccab4137a1dcd04a40eaa569dc1 SHA-1: 1ef1f3327316c435736e2cfcf0e93d78c154fcc9 SHA-256: d42e8cbd1d70d3d6b4d78456a6a432e01b3efb18685e3fc326c12b0beda13894
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains an exploit. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting further PDF files. This suggests a multi-stage attack where the initial PDF serves to redirect users to malicious content hosted on various compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f004e804---87151460195.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebc9e224a---43072639316.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/e3tkct83jdsnt3npoiqecckhra/wamuta.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/74bed9d8a9fd276c7299dd44e1e79373/36694644212.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/mv51brnbvekfu86fku0oc7co35/zapasimiduwaful.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/16654dad33e002099da92a8f779f5f74/49091309520.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/laxosepopomaxaritadutare.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/65104b508c50d3256ea9dcee854245ed/majifopas.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2b94425a15e1e6446ff2d66af34d74f9/rinukunepux.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/1088325209.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/wazesu.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/38730582136.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/36824445171.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16096412bca575---komazaboradubi.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/56929702745.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/vugazonajejoxim.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e223239aa5a6d5fa9c2d36aca7bbea38/wikodudinipoza.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ed06816fa6bfdda52d56eca671b04d94/3496605675.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/95209315408.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/87075929054.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/66682570375.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/sebox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+program+liftmaster+chamberlain+387lm+wireless+keypadPDF 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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 11920 bytes
SHA-256: 32ea42946da78080b833760901da6236cdf135803b49ba9dbf1be19d46d14b4c
font_02_sfnt_off00011a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 17636 bytes
SHA-256: 13c6c208d234e9d16effdfec6d98d3380a0efcde7e39eff83b0fdbbe09496774

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