Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c230aef6952ac57…

MALICIOUS

PDF

89.3 KB Created: 2021-08-06 11:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 903ba4dc7195b8a98f331265cfe4a3eb SHA-1: b393970fe54a947a1424f7a32c1c94836040453f SHA-256: 8c230aef6952ac57a8e12ff72cbe0f5fb5188bf651ee69817083c70fcff3f1bd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an intent to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/574bdcc5e841dba8a3c7a22f3062ae04/98625134980.pdf
    • http://jtour.vn/userfiles/file/39954147077.pdf
    • http://bet-balance.com/userfiles/file/4079143606.pdf
    • https://askisan.com/upload/ckfinder/files/kurag.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfcf15efc0---2165359934.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/076ddd9fbc2a3f16a9b2a32d4433a228/11846594902.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c29fe6c56ca---davidevalima.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca018ee6e---wimazopibijotimoseve.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ff3d297e---jabalovafivom.pdf
    • https://aneri12.cz/res/file/41020181265.pdf
    • http://malagi.pl/user-files/fck/file/senanidekasubogeleboma.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc4dc73dc45---78190977861.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf11dc7987---43190090103.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aac09b61fb8---8928201074.pdf
    • http://bethelcommunityone.com/clients/880032/File/92602798450.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/43ceb6009354b2c350a6717ec4e3617a/56198161454.pdf
    • http://sherylrobphotos.com/clients/56056/File/24318155299.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/13161568219.pdf
    • http://vksraja.in/fckeditor/upload/file/93566966890.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210528_44D7EC42E4DF5889.pdf
    • http://guoyangmoju.com/userfiles/files/76756319126.pdf
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/48109985015.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a175d39bcd2---46285009122.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+fix+my+singer+sewing+machine+bobbin
    • 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_off0000f9a9.bin
26ff0c59a100b038954ff15a46528ed89aee74b4d2f216445238a9622c088755
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 16440 bytes
font_01_sfnt_off00012425.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 16792 bytes
font_02_sfnt_off00013c3c.bin
fdeea1440e7cc5f56d27abae0aabf1200b5d1039c1ee3a1fd1a55db9cd27399a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3C 11172 bytes