Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e26c649bb1f22c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 08:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89061e308f5a944d102fc3163ed4b3a7 SHA-1: 09222f6006f84af7aefdb2ba77bd879b33e9525b SHA-256: 54e26c649bb1f22c927cd7d7d526ee3febea5bb656190867426182fbdf6e4b24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and other domains. The presence of 'utm_term' in one URL suggests a phishing or SEO-based lure to entice users to click through to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160839ab9b30e4---dokomakuvudabibumori.pdf In PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3a4dcb374---38150617147.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/domijuj.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/jadesugifepivip.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/96128450478.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828001c181e---parokuvugew.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/88007419011.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160830944d0a45---521430055.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/30900507120.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/11066884158.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/kitusowotez.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d69a45b6c3---28497676766.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/bepaweroditipawi.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/bizilexuxobadujumatexa.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb23736301---55965112514.pdfIn PDF document text
    • http://cochu.net/resimler/files/73374720551.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/cb90114ba8f99029dde41e0842f40523/tutabo.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/redqfqs7sdm0a3n0mip8ccfqpc/12508904295.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c2b7f8dd8c44e162e411f6b94ca2046f/jivor.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0aebe4aada---kupedanozebijiwiti.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/014cbfbeaeb9e83d0ee758461e326aa0/49105756550.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f2aac54a---pabimitalanu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c18bd650e20cbad6bd127ab0bc00d286/7876299511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pdf+to+image+converter+online+free+without+email+idPDF 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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 17836 bytes
SHA-256: 28a807a7267d12e9d3099285e9a5a14e498dab8a2c8abd8cf80645d1e3f95f2f
font_01_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 11008 bytes
SHA-256: adce1f69a33b4c83b38349b5d8caee6c433d51d9231fee47f31044149b24e674
font_02_sfnt_off00012516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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