Malicious PDF — malware analysis report

Static analysis result for SHA-256 330793a9303b3ce2…

MALICIOUS

PDF

93.7 KB Created: 2021-06-28 13:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2677fafbc8ddfdf00b19590285a0115 SHA-1: 89fa4007c2a8adebd6f0a0fef34653bfb5a24c4e SHA-256: 330793a9303b3ce2ed811178ba684f9e625051e68080364f25dcc838d5261e94
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing or to distribute further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/253bf33ab2a6f85a58d88d2e3a4eb99e/98259672907.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608dedbb2f457---43514885642.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/nikulutuzijojexumoz.pdf
    • http://bearings-home.com/userfiles/file/8917033274.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6e0b2932015a1f143f8b56d8bfde4e9f/37983299053.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/66nutvig7k4u7fiq29e8k7dmdn/64478179888.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/5e9eedf39e1614cc919b0086cb512418/66893618175.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad0f4c269---mimufiguwipagas.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38f84a0a83---vezofizi.pdf
    • https://plentis.eu/ckfinder/userfiles/files/dubawewapa.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb8256be26---89379275368.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6cb97d631.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/77a39nlfhicgop02rg3rn0l7eq/xubida.pdf
    • http://clubselectionvoyages.com/images/file/bevugisedinorupu.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160963bf6a1499---nenudepopog.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/m2plqevvvl5to8j863deo2ptf7/kunutekiz.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/44281336445.pdf
    • http://moda-minulosti.cz/docs/momin/file/govubuwamovajeduw.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/484b5894ccc1f3853873fc59e4e4906d/94866862293.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/fa3bari7lr4m1o89odhc8bak6e/zenuno.pdf
    • http://akinmedikal.com/uploads/file/1906308403.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3adb10579f---rolaxupunese.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbg3te7v2609agvong1pgtm8sr/ninogejejowoditemawejoko.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/ab2defa7ea55905d4ffa1a455832a984/somawimijubafa.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/gd431b58rfpg9ffcmp6bpriuq0/72994502237.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872e8b50563---bezixenezukewanufevumef.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961c5ad0546---47089945185.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160842131e5b61---14008046475.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=production+of+biodiesel+pdf
    • 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_off00010b53.bin
98bd252cb07a21cc95706e557ad17ae0ac887918b18ef0e40ace51cae422a9e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 10692 bytes
font_01_sfnt_off000123ba.bin
03c8c2a124b8f4dcf22a19976519a55dfbb6ffba8192565c82d386473394c2dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 17440 bytes
font_02_sfnt_off0001514e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1514E 16792 bytes

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