Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3292cf79de034b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 05:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 006f45e82e8dabca0830846f9f0ff2e9 SHA-1: 293a8f54087d0a8851c9a65c81eb2de32614e288 SHA-256: 6f3292cf79de034b089abf1e3e801e98e01fd44cb7b89ddc06fc6d160b6f2512
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=introductory+linear+algebra+an+applied+first+course+pdf PDF link annotation
    • https://ildiko-szepsegszalon.hu/userfiles/file/dukiredavojajafazipekot.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec428257b25---dasizonasek.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161114e1e2c563---gunupidurevadejeb.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/xosadipipavokajelufifuru.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/53ffaf304df3e0aac65c24cdf4c8df15/gebuxijugudenopet.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/45448736276.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607433e435fb3---xemudutilejixega.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/9828780281.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720de31c9d7---jevaretumemidodidupad.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/59027037991.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/6c6721c93df41ce242bfd36a19b12cc3/xokarewusalazala.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vmbhqj8p3rg913hcobfbl7rv5l/27359208434.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607839228fc2f---40213939099.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edada56cb86---33115809776.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cae6eb8b4---7349412582.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/h6ajustlmgb4pp51uhj5ivcnev/zexojometexolosenigumom.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/sotaziwex.pdfIn PDF document text
    • http://amajyuku.com/files/files/74611252436.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210717_064918.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d2f36557d---83744587834.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afae5a9111b---81934723478.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/2860355199.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 16540 bytes
SHA-256: 28a25c68c75b01703c64a1fc6b04225ab4f9ac58ad0f3205c05a62ad4a13debc
font_02_sfnt_off00011795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11795 11100 bytes
SHA-256: c5ca5d47eb6f502bf360988c4ac11171e80229702a15ed216c5e5c230946692e
font_03_sfnt_off00013125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13125 2160 bytes
SHA-256: d35cd7befe0e13644f611e809c6d233f3546688d22d6aa47982a121dfa8fbcf6

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