Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70b88fc485ad1c8…

MALICIOUS

PDF

91.4 KB Created: 2021-10-06 01:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 682cd60020486287c8a21a41f934451b SHA-1: e720fcace989cdb596c74ad87093e4b3d25e0589 SHA-256: c70b88fc485ad1c8f85f5447647f71eb07720eadd84239a8d208d47344c25966
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://hzkontejnery.cz/ckfinder/userfiles/files/zefisujefine.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0faae3aa6---bexogikosetobukefigebixib.pdf
    • http://gmtshipping.com/attachment/file/kaxatutazuzagasujofipireg.pdf
    • https://xo-sound.ru/userfiles/file/bakadowafebifi.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a154a1925---fekemosatifepewo.pdf
    • http://propack-th.com/image/upload/File/69308149922.pdf
    • https://bepcongnghiepphuchung.vn/userfiles/file/diwizitumogalirewaf.pdf
    • http://fotografieindex.nl/images/uploads/1972023947.pdf
    • http://guerrazzi.info/userfiles/files/22325126328.pdf
    • http://csim.jp/ckeditor/uploads/files/vibemumowamaweralukod.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/de12e9f8cef236daaba78573249deb3a/bazudaxadizuwetavisolevuk.pdf
    • http://zbirozskepodzamci.cz/userfiles/fejoziruxobugelabewuwizon.pdf
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/lufinugubikasixi.pdf
    • http://collectifff.be/imgdb/accueil/files/29298735402.pdf
    • http://2safe4u.cz/UserFiles/File/biravadakivesa.pdf
    • http://huefpdf.org/upload/file/dobibipebemamojabidasura.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ujq5nvpihbhb2idnlji1fro1fo/fidilumozotelipedak.pdf
    • http://openendrep.com/userfiles/files/46663323916.pdf
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/rutulibof.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139059be48eb---58105826913.pdf
    • http://blueyee.com/upload/file/052332226966.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-9-26/20210926174327885475.pdf
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/45344110979.pdf
    • http://tradotel-riviera.com/file/jejarakomutajero.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+meaning+of+god%27s+will
    • 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_off0000fb0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 16792 bytes
font_01_sfnt_off0001131f.bin
effdbe49598ca4400d0a4d7a6c346fb0f32cf38bb3f0fd8549207b4effd656a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 20200 bytes
font_02_sfnt_off00014735.bin
87c9c17df390a2a7bc0048fc22e2026dd971b0a45d09e5d9471f47242795fde9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14735 10816 bytes