Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a88ba8a47dc764…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 06:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6cf784e3a635040dc21acf7fef29e34f SHA-1: 0317664d750a5f9fd1bc0ce6a01fc8bebaf6ab03 SHA-256: f9a88ba8a47dc7641b116f18559c6b57823929b984b1dfcca0931ed76fe09c35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate this PDF is likely part of a phishing or malware distribution campaign, potentially using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=instrumentation+and+control+engineering+interview+questions+and+answers+pdf PDF link annotation
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/4135434579.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/92673045480.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/38646560475.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/kifigekubiv.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/kuduxibanonunux.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a0629adcb87---38118551196.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d94975e2---83977447350.pdfIn PDF document text
    • http://centromp.it/userfiles/files/72435070841.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/13300939405.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/48978719039.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/8570911758.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fb231c5eb29---liburavakusinu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rujiwezesulajamopipasafa.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/sepatupefazafef.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/65554723935.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebb877f527---viwekowabokobubes.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/04hcji3ieiaa5ls5glqeu9t9fq/topaxopokasawafomose.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/577860a1cb2e153ded01b34da32130bf/52360043748.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/dubixijevurim.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/gumutozam.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/sarozopikuwerojumuwazeji.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/v9jgolmb6duvk7t23uslca0g56/napomog.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a4c670002---40447788451.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fe785c73---lukisinopinadowo.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247625e945---27539942877.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/gemujelewokot.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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 17700 bytes
SHA-256: 4a3f4b1408cbe9550ca333563d13446510bfa0c96c94b883f81190407244283f
font_01_sfnt_off00010ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 11312 bytes
SHA-256: b358fe88577d3aee3fd8e466e45c478702c02bff249ceaad6a66155c54d16375
font_02_sfnt_off000128c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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