Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c13c77713849367…

MALICIOUS

PDF

86.6 KB Created: 2021-07-15 16:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 097ed3ad3a3409fbffef16b921ab3126 SHA-1: cdb0148aa552f206310abe772f69e2e3e2a9f629 SHA-256: 0c13c77713849367e48a25c33c520cde51eca8286363d070e6d4aa1c60a5aa63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.companyforte.com/imagenes/editor/file/roditikitotiwifo.pdf In PDF document text
    • https://guapa2.com/admin/fck/file/fomekerigomitetezejavu.pdfIn PDF document text
    • http://gerocuki.hu/user/file/62902083535.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/dc756144dc53a939017556798c0dacbe/31148363737.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cae56fa0742---tajenitiwaxidelasi.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/dozaduratuso.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/gatib.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2f1ae7b83---vurelisujitubozevurud.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcd20dcb19---2870609848.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/87976396746.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/23627716827.pdfIn PDF document text
    • http://jarosi.hu/files/file/17131551498.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/wizijokaxaxipodag.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/rugupemobozativeg.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///60394001662.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/55198189911.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/82176304367.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/likuxo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b73e5de73ec---85091316878.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/vepimanor.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0c784543---moxerifoju.pdfIn PDF document text
    • http://partnercable.hu/files/81071511329.pdfIn PDF document text
    • http://susutour.com/userfile/file/98710443951.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a99effe5b05---tonimobujebebadefeg.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/qjkivul4n1csjea5jstfja42tv/90236860612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=quick+and+easy+lunch+mealsPDF 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_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 17568 bytes
SHA-256: bbd8dc860e07be5c7bff750d7070653cf6918daec5de45845ddb5161d07411a6
font_01_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 10684 bytes
SHA-256: 6b707f05fcee9e24f5d8725c21b1845fa45f7dbd15f41e9f59fd18ab6709765b
font_02_sfnt_off00013510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1