Malicious PDF — malware analysis report

Static analysis result for SHA-256 24799015b33dcf43…

MALICIOUS

PDF

73.1 KB Created: 2021-09-02 17:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2dcc24626687a729fa3cb74450ca8a9 SHA-1: c1303de29ba4b271f7835ce0b016f0f003204752 SHA-256: 24799015b33dcf4381bb513e58c0518105a94edb7797db8d5ff0a52bbfd81e34
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://s8radziejowice-paszkow.pl/userfiles/file/91434443732.pdf In PDF document text
    • http://smartpaintingplus.com/userfiles/files/supapimu.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/14833503526.pdfIn PDF document text
    • https://mattress-leader.com/media/73052674389.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cd1fa70e1d357d2fc48c8cb89ae230d7/99880671762.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/92761486490.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021083120533627.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/60113344508.pdfIn PDF document text
    • http://dytac.hk/userfiles/28709333511.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/36839916999.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/49375645297.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/47813422780.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/lofep.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/pimarafafoz.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jh1mdvdgnnkpbvsqg3kvs8ig1t/40294798006.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608675c7b277d---96163275366.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/gimiwitovefejixodoleme.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c6dc996974370828d5a1a80680ddfb29/jatefilatafen.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7cd5e542---vapujadewapixofirez.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/58151957634.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/23775609525.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/vefasefafuto.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/31254216eaa091b41421c34e4139d37b/17391168204.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/5405215603.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b539f3f17---54614440556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=brinjal+grafting+pdfPDF 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_off0000bcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 16440 bytes
SHA-256: 9bef96a7796ed9933f2c729bb927ba4ef4091e29d1dbc98c32621f3958fddc94
font_02_sfnt_off0000ffc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 10436 bytes
SHA-256: 49be1cd52bdf814076268b062f07453f1dea2e53b358022c30c96b8eb0852fe5

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