Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fd4a0ff908dce3…

MALICIOUS

PDF

69.0 KB Created: 2021-09-02 02:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 67ce8efa74f1e5b45b80a8d80035eaff SHA-1: 732a89b9b0f7d83d84dec8ddda4fe2070b06e63e SHA-256: 78fd4a0ff908dce3a92fc9f6273b7d2f0bc1adb46559ed0fc8a3c8b78f38e9fb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. No scripts were extracted, but the nature of the URLs and the PDF structure point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://oniceh.ru/uplcv?utm_term=healthy+and+balanced+diet PDF link annotation
    • https://x-software.cz/data/file/zuput.pdfIn PDF document text
    • https://businesslife.com/content/files/jezoxoluvefasidojeg.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f20e54eb397a7b5ce4351fdf3c3f6efc/37006856028.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086d172c80c9---kirekexojozukuxopa.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079e756a426f---bezaxetopesawedese.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/78jdfhfd632dqf35vrpdt86kf9/98662276669.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/dizedago.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210810084155.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/761fa21c4c3209daf0b209e85324b26d/xoloxupew.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/66471463149.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/dosugugibejisubufin.pdfIn PDF document text
    • http://fitviewer.biz/files/file/kukijowigeva.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/29300889889.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d41c121f---zuwuzonov.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/rakerojago.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4kjudj93s29ctenhp38kmnj9qu/53754179993.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/33590598394.pdfIn PDF document text
    • https://stvorki.ru/files/file/samoxeditatumiwu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3352a16e4bf2148e80522c546691bb5c/476065360.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/sekafoxuwin.pdfIn PDF document text
    • http://skene.es/userfiles/file/61248800755.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/22650857467.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0753af0c1a---44794592431.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcef70c2f56---xirugijatujijoxamofu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1db6132d7a4f0b639dff75651a7761ff/36150980323.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_off0000b43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43C 14360 bytes
SHA-256: 0297d379e93d7cf01a06e7de532676b242f0148b930819ed0a298686458da60b
font_01_sfnt_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 10324 bytes
SHA-256: 740c026be363de1843f2bed444da9df23abcca24261a70bff1849dda64da8ba3

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