Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c9d62987e71240…

MALICIOUS

PDF

76.3 KB Created: 2021-08-11 08:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eccf898574fb93f935ede0fbf614f6e5 SHA-1: d71d87185d3cdb7cd5346cfd4028e2747913bd3b SHA-256: 99c9d62987e71240ea8f4ba9a1266f7b574836acf97711f316fa89eec93f0cd9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a94176cd1---31431912818.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2b957f531---xosiwixolusunuw.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160883b7a88ac3---63143021281.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/12703953311.pdfIn PDF document text
    • http://linza-market.ru/upload/files/memaxomasizutenuvevok.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/27796454773.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/86540103731.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/36417099639.pdfIn PDF document text
    • http://xenangheli.vn/public/files/41975941436.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/sugogebarapewurapunegenes.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/77ecd4141716c019234ab1a7f88cc9c2/dupefekenusijakat.pdfIn PDF document text
    • https://dacola.com/upload/files/regidirepigimazofunuwuxov.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e335a394f5---jeximu.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/3dsdvekjeqdo0ua8moluelvdo4/welaruwo.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/54972969446.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/62036241826.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607363e54c143---talugugebif.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1l7ssij1uv770482cofkm4lou4/balodizamavo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083e880b0595---dapuvixajudozogokezup.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/xipov.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/gazekonizimi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/eba64669fc48da476059025d42e19f6d/76300809474.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/suxogebutuwebosilofep.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd88967117---7799484512.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/zazide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bise+lahore+board+inter+gazette+copy+result+2020+%28pdf%29PDF link annotation
    • 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_off0000c3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 16052 bytes
SHA-256: c5a2af326e3b2201b43ab04a39c2cd9af485721170075c7a65d3d672064ca8ec
font_02_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 11764 bytes
SHA-256: 24cf1f18b4ffe4ca794d2cba731d3db33d4df95e02e45d04f77edfe88d0c1c1d