Malicious PDF — malware analysis report

Static analysis result for SHA-256 5788ca8815b41adf…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 00:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a3f7f0911923458a3bf3582851da61d SHA-1: 3f552f45e30cb00af1983870704252495c14f56a SHA-256: 5788ca8815b41adf9f3270a2d45459a6330f86e8758ee5af2cd38f76a10f2766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of external URI heuristics and link farm detection rules supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://oniceh.ru/uplcv?utm_term=the+aspern+papers+pdf+download PDF link annotation
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7b262988---pebosuvowemopikowikug.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/4101301878.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160855685d1dbc---52065134858.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/31335276213.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1c7e3b6ddd000875b7585235d7fd25f8/10235597781.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/cdrjie37mnismsj0focn23l7be/31958233882.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/s6rpl1a1b25g82pagb933o6dt5/68768484260.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac9e7c443f---11758835787.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/77181125682.pdfIn PDF document text
    • https://iohrp.org/f_files/files/tesan.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0727cb8f9---beluvomupal.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/vinomibiledusor.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/69312204122.pdfIn PDF document text
    • https://ranagro.com/files/10578646135.pdfIn PDF document text
    • http://kunbot.com/upload/files/riweviduxaxuxuwevomodun.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b571343002---nuxipisoxoxagomeponulute.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/guvivakikizanalutelezo.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/milamoninu.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/80363529517.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/risibigemuvukutapata.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/mitopidinipudikuwij.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ab265a25d---13022847335.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160fb67b9e315d---samozovu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 17856 bytes
SHA-256: e1df5b7ab7f6bbe412f57cef0fc01d8ee2691869449663f406c1366e719d26c6
font_02_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 17636 bytes
SHA-256: af731cb87f995afa34c727c26da986ad00ff69745e9b9c01f4294061fda41228
font_03_sfnt_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 10452 bytes
SHA-256: aedcf62e9f57a7ac3b6cda1deb8bfeefc4537412e97b793762a2656a22785978

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