Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c620834ec63dcf2…

MALICIOUS

PDF

70.9 KB Created: 2021-09-07 14:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24cb2227d8d69512e9886cacbcd7c53c SHA-1: b3670505f87aa56e7d8b632b71216644df92c1d2 SHA-256: 6c620834ec63dcf247edc7977eb3cfacd25fdd00467f5d310577d7bef6e2f495
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://diysmart.net/userfiles/file/931731847.pdf In PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/lojiximukotalakesonara.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/galipaje.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/22049515110.pdfIn PDF document text
    • http://erex.hu/upload/file/30802566555.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d2d790728---53817572063.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/detetiwuvinikeximivadaxon.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607421ae4713f---27615921030.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/73610583243.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/v5tfg7qetl0d6u7iktu627rvif/3141412232.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/sowabozitomutinajej.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/72944349548.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gigoworovexanidugurelej.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/biwulafa.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/1220524197.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/fiwipewalaniwuburow.pdfIn PDF document text
    • https://stopserv.ru/files/file/4395425792.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/zokepule.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210719_8D374C59CD3842F6.pdfIn PDF document text
    • https://electroagro.es/pub/files/6193525671.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/70944995903.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/n1cil7aku2e36gnbcevh791rb3/zakosuragumagufeta.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9cdaebbe9---satajew.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/70168475051.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080449b0ebf2---buxoretarunesonemodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=talcott+parsons+libros+pdfPDF 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_off0000b519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB519 15828 bytes
SHA-256: 98a66356f0ac76105acd979b1162a74f1e4e910385f95b74071f7fee77f85fae
font_01_sfnt_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 10584 bytes
SHA-256: f595ef1b804765c2c94d2195cfb5529394d6bc2c98ebe3bdc03a85144846c5e7
font_02_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1