Malicious PDF — malware analysis report

Static analysis result for SHA-256 833bd2443a8d6b31…

MALICIOUS

PDF

87.1 KB Created: 2021-06-17 23:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78ac80c186991a67fbd89411130f31b8 SHA-1: 298d916687eb8a8b4be66596dc362878ed31a434 SHA-256: 833bd2443a8d6b31efc9f68c9ffd63fc2a0738b9659fc68bfea96de82a861571
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://shs1977reunion.com/clients/41590/File/jafugukakufiwav.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089656c001ae---92469374518.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d71819f64---nokovifimakifasovoros.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b400e4795---46072324212.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac514e49f07---geregedi.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e889349386---11126674464.pdf
    • http://highendschmiede.de/highendfiles/file/4034287515.pdf
    • https://deniz-sogutma.org/img/userfiles/file/kutepovipibibimotunife.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2da48223f446106cfdd373e00e24a267/ripozovadikot.pdf
    • https://isosklo.cz./uploads/80765711627.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ea9c32a822daff340c114e3e33199cbf/5927369375.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b5f9921e4---fiperorifivixuju.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/i3jhdil1ck3r2dc0qrtak826v9/24397801387.pdf
    • https://lecormier-menuiserie.com/www/upload/files/53226930842.pdf
    • https://srmhospitalities.com/images/bulk_images/files/nusitifojiwe.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe73924447---tenivopu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=spongebob+squarepants+battle+for+bikini+bottom+ps2+iso
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011167.bin
a8c39e6e2dec4015af02a8badc7a4edb98a5e56f912c86c8bf6cf342d1b0bbc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 5788 bytes
font_01_sfnt_off00012509.bin
f9682364b82a362fc56b833d29f2293bab37efe710533b30e2ff299384301f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12509 12364 bytes

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