Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d796ec1b39b0b55…

MALICIOUS

PDF

85.9 KB Created: 2021-08-01 09:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d7671862ba571119cd4c2edadda26ef8 SHA-1: 07336b945a71480235d8c51f991ae68721a6b827 SHA-256: 0d796ec1b39b0b552af42e18e20cf11042fbf56ceca2d7346197721bed1da635
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://leganordavigliana.it/uploads/file/86318321213.pdf In PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/a0m0tp6erp8qrlo875187kpqd3/36619440176.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/dugajosibidetapojogusim.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/85133463988.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/87923228346.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160949248b98f3---7236134818.pdfIn PDF document text
    • https://isosklo.cz/uploads/nodexetonixap.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/wenekupimunexetepazo.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/fizid.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/98848928123.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/aa49f39d4cdaeff6247016a66ae28ead/66473962948.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/bevifekubawowogi.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ac57d1d391e11bf2e2b3e1450d2f670f/tidal.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/91795492005.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/walijifupimutar.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610531bc0606e---xoruwototaxugesawepo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/3fac1adbc8a816ac44bd8fbc1bd858ad/zixadoguzek.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/badatixexun.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/22645538491.pdfIn PDF document text
    • https://mytopics.it/uploads/file/zumajewulupezotepelopepe.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/15881288295.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/27113196150.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871635c99b9---39967192702.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/efa9cef00ee0acb502eaf53ba5121a11/foxopawuxepakezabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+backup+my+phone+before+factory+resetPDF 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_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 16840 bytes
SHA-256: 41cc830565ff828cf560cd95037d54af8ef28b084e5c3242414cd324b05fc658
font_01_sfnt_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 11364 bytes
SHA-256: 1549e28f7aa49126949e6653d306f75ca623de9bc458827f1542cc8cf82b4f4b
font_02_sfnt_off0001317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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