Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6dacf9e1e51f742…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 01:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dda501887dd3b5ec00c5889fabb89c64 SHA-1: b68d6a6e7cac80a37a0a76aa0cd17f4c013011cf SHA-256: d6dacf9e1e51f7426ba3139f90b3eb2a82da9547749ca7b71fc6f0a0e6606f91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. These links likely serve as a link farm to redirect users to malicious sites, consistent with phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=hiroshima+john+hersey+book+pdf PDF link annotation
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9239b374---gozenasinuzorogo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c056c14d1b8---tomenovogunosen.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/vofekabumadepop.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/53605c173bf9bf932ced5bb697b41678/55949407517.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210602154006604343o73s6k.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/zitatovisazuvipur.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16079e67e7edc4---33997223749.pdfIn PDF document text
    • https://areicon.com/images/file/setorugutilezejebim.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c15a0ff246a---buzopamojegazojokosuwed.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c4e8c2c42---85779967033.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5fa1229b302e902044d6e7273d65f27a/totarubedorogelekolimami.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/fexet.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210608_5A5BF564BBBD6BA2.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/016ef23d2bb6ff6f3082f647fe8e665c/21407985842.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/4ca874b24bfd33e340a1a26115dd1924/sapagoxixupe.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/jemitafivifusek.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/ginab.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16095904ecef57---xikarobaxekipo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071ea398f844---jovuxejotarifenexupe.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5e721db8---bukotazivujevaxe.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/lawoselo.pdfIn PDF document text
    • 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_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 11084 bytes
SHA-256: 03e007937211c88b987fc080f18aa83891be4c9bc720fb8ffb15ef361bab8930
font_02_sfnt_off000119dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 17892 bytes
SHA-256: 626f92b781dd1fdd4c2276228489a3d67c4e5d198d6cd0318c824d0b4972fc50

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