Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dce0401b26718d4…

MALICIOUS

PDF

85.6 KB Created: 2021-06-27 10:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd78abf566e8241a9250b086c0a81b7e SHA-1: 4b008609a8dc0ba01a8151f4eb130e60555baea0 SHA-256: 8dce0401b26718d4a4ef91b0bd804514b68f87c01efd23d528d62f27577f3098
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains. The primary purpose appears to be redirecting users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://intergeored.com/upload/File/36115457494.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d32c421942d---sejimivonanidonefofiguw.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9n6uuqr2peb0b043irvcqavp90/16468366116.pdf
    • http://gernano.eu/gfx/userfiles/files/somedifabalidojiba.pdf
    • http://xiaohecollege.com/d/files/2998593741.pdf
    • http://writtenmail.com/upload_images/file/1708839395.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c96ee1a5db7---83758894377.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc8810399---53510311665.pdf
    • https://actorconseil.com/files/file/85512037669.pdf
    • http://kimhoatra.com/upload/fckimagesfile/nowefazatijewokuledafabij.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe9187bed---71982428227.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/93umah6fqdi3vl8m7qdrbavh4h/56763062204.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769329a1af5---71739757321.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3225686e---32480572517.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0efe00e060---83932733992.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/60f7c9a4d2f0b053b5a25c05162bdba1/jekakuguxovadegizezabem.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/250241463619.pdf
    • https://nada70.org/userfiles/file/75426635285.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3b01437e11607dd6d6d2cec4b2ead9b3/97684416116.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32207f505---wurebazado.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/bufulekanavalunonakox.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/dubikuvekujotonokevotase.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+boil+one+egg
    • 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_off0000ef1d.bin
e6ed6c7ec3c3ec808978786f43fba3bc0e78588e8e88a8596f7bf34ed5092c0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 10072 bytes
font_01_sfnt_off000105a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 16792 bytes
font_02_sfnt_off00011db6.bin
0b8b6276f00bf219caa1d82574d85c10000954cdbc8206ba82767c03075ffcc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 17104 bytes