Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7865cf98a51475…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 01:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7947d385934625555dba31bd93b02b16 SHA-1: ad47e5a04ecb76c65e7b5616d1ff1c65966e52c0 SHA-256: 6f7865cf98a514755fb1ee39b6bcd8070577c9ffd7821349803a14ec45fe4afa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading malicious archives. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides a password to decrypt a subsequent payload, a common tactic for bypassing gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=como+juntar+pdf+em+um+s%C3%B3+arquivo+online PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0d0cee07---52905475907.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608553d92beb0---xelilok.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/wijipum.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/tr1rcakgv15nm3h0e5ffoara14/rubodokumiruwewanizavu.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/dafelafasipemumol.pdfIn PDF document text
    • http://ausafe.net/images/art/files/48994201493.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5efd4aa69---jojodozijujonalexes.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/mumuretuwij.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/trfl45rv11d1oep3hmt8g8lvh9/23502639852.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/wiwefofut.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/12719840373.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/p4vvmmso3uof4ssj7mkmv0nb17/tekala.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607487fbc009c---83383408360.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/54215423429.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/53150631328.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6f670ac9---42825673656.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/gerekemudofuruniru.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/23069632376.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/rejakas.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/37812052455.pdfIn PDF document text
    • https://khanikango.in/file/77028060698.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/vedamujomo.pdfIn PDF document text
    • http://rsst77.ru/upload/files/ramatimeseposofidovi.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/sofiboxumozas.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9c5ad8ab3---tuwigekelulasujofew.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/90953728089.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_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 19848 bytes
SHA-256: 38f2a9e610d965475aa363e009efbadd8a7d3bf35b8451627f18cd7556849c10
font_01_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 11268 bytes
SHA-256: f2b4fc335ef4ba16e4b2e114ffcc83ef1274bd788aba1be9b4e74a92117f3e90
font_02_sfnt_off000126d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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