Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c5df52d4d9e29c…

MALICIOUS

PDF

95.7 KB Created: 2021-07-07 15:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82a4dcc64fbe1ab3d19dc2cbe8538742 SHA-1: c8d93be5491b97da2a26a7d5bd43156701625f8f SHA-256: 57c5df52d4d9e29cb8fe841fba5081e1da974d85a2d3c40c2c299a375cfe024a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://laborke.ru/uplcv?utm_term=poetic+techniques+and+their+effects PDF link annotation
    • https://cmsschoolkg.org/userfiles/file/texojerojakegufomebasup.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7b8719b3---wunalofufiwogaro.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/tegagamas.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/daf4061fa26779e93f65ae6cd88df775/rudaxejivu.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/27885953292.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160731a47d0aa3---wadifuduwekigujaroxobum.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uvmoku1v0rl67rlvmm2m4d0rvc/53055690862.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/44704964145.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/nevitinawusufatujuwewoke.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/60555194194.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/077mldgcthq03m55cb03gupjl6/lenobawupokobamaxopo.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/44891045788.pdfIn PDF document text
    • https://ghnservizi.com/file/11811073631.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b653301568e---85646203403.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748d7010e43---tisisufolupuburojeg.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607617c839c9d---pegunuxezegemupujoz.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084c2532dd4c---mazitugojotefabije.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/d40f1d2721897b252a459f26a059deb3/worosuvuzabuzejotewenuf.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/fixuvawuvukujotefaruxeve.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/nepuganuxave.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/gemugexatoxoge.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/17058084352.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160750f40b3237---17281805769.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/95798383651.pdfIn PDF document text
    • 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_off0001158b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158B 16792 bytes
SHA-256: af7b6b2e17b9ee2ed648867d9375173a084873545392b008200e6d0e4c512940
font_01_sfnt_off000140f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F7 10772 bytes
SHA-256: 8ab8cdb46697eea2972ae66a9928311d42edc915357b6c2715bc1c867af10cc3
font_02_sfnt_off00015989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.