Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b26045e967b0133…

MALICIOUS

PDF

77.9 KB Created: 2021-08-11 05:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77aa889259bb8d72bbda4132cd8e4dad SHA-1: 9f22c96730638a574f51019a65988bc8c4a962f6 SHA-256: 4b26045e967b01334a1fd7bddc14e15a522c32485b232141c84e07e561c09406
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. Heuristics indicate that this PDF is a link farm on disposable hosting and that some links point to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://kameleonhastanc.hu/files/file/fugokupudan.pdf In PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/37534591264.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/ruzezewotojib.pdfIn PDF document text
    • http://healthywithhart.com/res/file/1020255333.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/9c12e086ba01d82198869781b613f976/69839049580.pdfIn PDF document text
    • http://becucci.it/userfiles/files/vukifededi.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/56714240242.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a669934a821---lizulivegafomabesanamunaw.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/75506945670.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/67115163423.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd54240450---vokuwobikotas.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/aafb478262d83fd1a10c5d51682ca05b/wikavijasovupuxemimed.pdfIn PDF document text
    • http://le383.com/uploads/files/gifuvusozura.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/99804880932.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/xiwexedelebitukotozurob.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca405b9ae1---15083538127.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf1966240---xowibiwi.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b6c5e5ed4ec4709cee06b4f56d1f5d89/zegajuso.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a56ee9a5834---bofasax.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/o8pf9hot9i9e9rbkrrql7k8ooq/tipifasebij.pdfIn PDF document text
    • http://air-ned.com/uploads/files/gobifiwifakatep.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/xupupilulosirisopedel.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/30179605373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=feet+meter+conversion+calculatorPDF 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_off0000cf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 10536 bytes
SHA-256: 25171b47a744258db75fba15dc55126ec973a301c3bba66f38774f666f105c7f
font_01_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 16136 bytes
SHA-256: fcc96df5947ceaa774b57c83caeda0a3abc89fbb43f1a34af137c18d8d546629
font_02_sfnt_off000110d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1