Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbaddda2656e9b7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 10:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71da1a8c4df3960a9da8ab12a3cb15cb SHA-1: 462798067ea91bff26690bb8520b66e4fc13a564 SHA-256: ebbaddda2656e9b73f727950395bcf65218801e9de42079b12d10ca3d8db91a7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tedvandergulik.nl/userimages/file/misuvemerosiwusu.pdf
    • http://marty-triple-m.ch/inhalt/files/rofijababudusezuval.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161150717bfbb0---28714278735.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f60cbe1d997e156e3969d99e1dcd3457/jigesibes.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eada22acf---mizubolivamukifupu.pdf
    • https://alexandrapanayotou.com/web/images/static/file/15534879059.pdf
    • https://flyingfish-stay.com/userfiles/file/99580938348.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210727_EDEB391C7BEC135B.pdf
    • https://telorgabus.com/contents//files/lipizuduvodagun.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8667074bea---xusigerunonuvezegusog.pdf
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/10378283361.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/40247790912.pdf
    • http://spadhotel.com/basefile/spadhotelcom/files/vebipekepe.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c560852780d---supojesevoladitilokape.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b39008e0f---83901271894.pdf
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/fiwijerejinun.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16076da2ab3c43---23808494112.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/65063906800.pdf
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/90898857443.pdf
    • http://banhangcongnghe.com/upload/FCK/file/fimofas.pdf
    • https://recapress.com/ckfinder/userfiles/files/vamukadej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=faure+apres+un+reve+cello+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_off0000d7fc.bin
b15882096a19275714a69c93c393da7fc15569f933548b7a12d4841177a5ab4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 19028 bytes
font_01_sfnt_off0001092c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 16792 bytes
font_02_sfnt_off00012143.bin
b616469ba78f41aba72e53b4e8423821d93ac6dee3f0c0bd7ff0203e6f57ec3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 10568 bytes