Malicious PDF — malware analysis report

Static analysis result for SHA-256 2810cbcfcfd2aec5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 19:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a5e0b8e76af797d7846e31af56c978da SHA-1: 5268b76349cc49a38b9244935f57e58fdef04d28 SHA-256: 2810cbcfcfd2aec5950509e5c3dda8aa6a250806e166b8cb407411b62e9eb078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further stages of an attack. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c46d87a414c1667f0b80b4b30f03fd66/mesarujivak.pdf In PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/pidofagurukakav.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/vijatupatenijamikabuv.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57fd7e1c4f---64477618723.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/77234739135.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/galutuvonitexurori.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p3clljej9ae40vgfra5cscljj0/37305797041.pdfIn PDF document text
    • http://nensi.si/upload/file/48522208548.pdfIn PDF document text
    • http://airsoft1.ro/files/file/wekemexe.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e12fd4af0c37a375bce4bd5a46aad82d/32972988670.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/45614379956.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/20371272648.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160905d5e82293---retudi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b7dbd52bb88a7fc8cc2a8f4a1c5c2ccf/jomabon.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/dojogaloxaxolavalo.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/mesotem.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6055b9ff84e204b804f4099605bfe28c/zuwedevetelawi.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/50989963133.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c11cd31fd97---547957939.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/jabozir.pdfIn PDF document text
    • http://signauction.net/userfiles/file/lomarijubora.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fac17cacb77---biwosesunurexamaxanefoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=g2+road+test+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCE 10576 bytes
SHA-256: 95d71e461ae641455aa5d95016e893ab742cb978759d11f090022c5ea90b5941
font_01_sfnt_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 17116 bytes
SHA-256: f86eb75c800f0993be092b7fc54e3282bf0e911797ebffa114b005bca0429e39
font_02_sfnt_off00010497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 17604 bytes
SHA-256: d8d634e9625e63240f2af447a13ff8b8b2708520bba2933d539e781b3185031f

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