Malicious PDF — malware analysis report

Static analysis result for SHA-256 8352cfe5668c0e60…

MALICIOUS

PDF

91.8 KB Created: 2021-08-05 18:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7d0e9b7686e0bcda49979242a51d397a SHA-1: e324cc38b078445ab779439b810fe95fae451b5f SHA-256: 8352cfe5668c0e6091cf17f22fef3b4122ca672b432c2dbdb2ed2354700061f9
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://soccerauquebec.com/userfiles/file/17227848478.pdf In PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/rasetakojubifugi.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210703042024430679gn8n9.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3a9b55eb---getuwuzaxuxegulomigiden.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/dovodilix.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a96632bab56---niwikujodamuludanuwuk.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd81f313a---70680783632.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/pojesakojilisulojafojozuv.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b115a603b55---78667469108.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/todumazoj.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/thgp4213poo6vpt1pa0fga9c9c/nixudabejawerupale.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/6332304070.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1386797239ac92bf7e5eb1479fb0b687/poxiwosalurum.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bd2db2df4---doxedalubewovitinid.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cb9bd41819db98c5ce8ea78c6f314bfd/bepuwijapokekigisudojebav.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/56492854042.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/96319345403.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160782e56d9a00---ninofovusumojivoku.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/lumekusufabip.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/3to57guu3o1pd0kc7mpqe16nt0/mafenelorataralowerixate.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/94331142917.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/lipogaro.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/ruzutetobabifaxurar.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/65291815205.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7845da44b41b7f7e800ce76b4ff6b382/wivovekonowoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+a+chromatic+harmonicaPDF 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_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 17596 bytes
SHA-256: d3615824949d48b95024804431da19c1aaa2267d4a1f8c973bb7fee1b9b158f5
font_01_sfnt_off00013284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13284 10308 bytes
SHA-256: fd65b783bc41692c026b2a874068c53b0b2a511146e34ca5df99848f40df57e3
font_02_sfnt_off0001499e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1