Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2eca9c6a0da2f3…

MALICIOUS

PDF

95.2 KB Created: 2021-08-12 21:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1183c78dc7a1ad623d55c694d64753cf SHA-1: fc5c02bc12b9f41aec0158b95605dc3852086223 SHA-256: 4f2eca9c6a0da2f364f8c39dab3acf842a0f741ed2186d0d2a545c07620ffdce
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5457fc6452b9ae06af9cdfee2c4884ba/67327439541.pdf In PDF document text
    • http://hidropro.hu/upload/zavanab.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/60995210844.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f038fc22548478f1062e98ab5250a8a/78392793519.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a88ba71c175---13883877034.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/jazurumomokiwobame.pdfIn PDF document text
    • https://ikansambel.com/contents//files/50360710492.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/pesidujuwozudafozur.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/98816722580.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af62a691303---30904656004.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160804c050c76a---92570099173.pdfIn PDF document text
    • http://matras-devison.com/upload/file/56098652975.pdfIn PDF document text
    • https://adikkedua.com/contents//files/jakenuripurupijumiwaril.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718400a3d8f---41766491363.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/suzuzazitomumako.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/gth02ot19rfr5g7gbnnpj2li98/65944366423.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/lig160i3r48rm0lnnp0chorgej/bugaxitugu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8253db580f---duvazupimudef.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e285d84feba51b5f5116f8af96e161aa/36528805091.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/vulizewodibegewevinu.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/b5963d751450ab12f80e93913dab07eb/bemisuliwikepisukuxonumuz.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/gijadudineruwim.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/derirazafupolurix.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/98050317023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bernina+deco+340+softwarePDF 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_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 19036 bytes
SHA-256: 1888020fddf9700717676d07efbc91e77aedce191d007f52bf3cbaa3a7286fb6
font_02_sfnt_off00015327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15327 10936 bytes
SHA-256: 657dc146ee9e9b4c2ba8386df5e369a32309996ebbc6f292befc2b976643b427

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