Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99472bff8b67ca7…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 12:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e66aa830dfdf8ef6f6210fc83e25361 SHA-1: d65d0e69453c46cbedc4665749e63306f050395f SHA-256: b99472bff8b67ca7bcc69166203ee167ccc31556e22fcf5fae1207a1f7d3aca5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Additionally, multiple heuristics indicate the PDF acts as a link farm, pointing to various potentially compromised WordPress sites. These factors strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3dc97d79---32426592598.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/24df3732a76d74d34cc651e9f1626416/zameniwezutotokeboraxim.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/6483923629.pdfIn PDF document text
    • http://makaroma.fr/upload/file/75625219330.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd04efb79---66322570103.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/faxijibetujuv.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/gibewut.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b94c8484994de10823e42218b88dc1e8/xomigadupolezelupa.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/losuladasafufunodep.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/jifogiresivodota.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/wilujufemawefidevuvo.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1illq5ase9ovkd0m7qb7vvnpkl/81636731659.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/55953473521.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/38979205965.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/13081372300.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dddf9b2e4---27654341486.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109040001305471.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/gawuwada.pdfIn PDF document text
    • http://pasted-radio.de/web/files/rerinelifafupasu.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/sixagasumatarerajiwi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/6btp2t1u61q62b2ea7hop3dc0v/31106527483.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/tasobozonapixilu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613835845a144---puvukedunewalubizesasu.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/tolibugetopupumawosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=medal+of+honor+game+androidPDF 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_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 10528 bytes
SHA-256: 9f9a94d660c8e80fc847953c803c59e806499230b784ff86017c2122f8fdb879
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 17008 bytes
SHA-256: 40d678120a2cb344a09493af4018d1f7ffc1993a9b5628dc84488a1377b44a1b
font_02_sfnt_off00012c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1