Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efd69d2ec5d52a0…

MALICIOUS

PDF

70.9 KB Created: 2021-09-02 18:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b956d3ad94e098463a3199d4edcb50a SHA-1: 6bc5cae330e8423f41bc3ccc6f1ed7910b06283d SHA-256: 6efd69d2ec5d52a0d62d277924a73dc3c67d935c7ea47cd73201bf793ba665dc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using these links for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crysiq.ru/uplcv?utm_term=cronusmax+drivehub+manual PDF link annotation
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/46ccae4324a5259daaf89caedfe07b0c/18972635335.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/42506093744.pdfIn PDF document text
    • http://stl-hk.net/userfiles/92473284843.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609347160ab8b---xagepazonunufigewebaduz.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/zalotapesowep.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/nuleguduxubutodalawep.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/5357662470.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/pozogezoku.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16091029ad142e---tixogovusirigowitibovesi.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/53936797876.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a26037ca2---rodanakuxozovufuganum.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075f671ad8f0---78952910642.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56853562262.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/wadoruje.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/dudezikekamusizejono.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/tumidavezus.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca17dd0bc6---lulilunopor.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/34928507378.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/44060034911.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/tijuzofujetiriromolit.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/vigezonedutewurapuv.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/2642697769.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_off0000b6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A0 15572 bytes
SHA-256: f7e2d03fd9e79951afb1f9df8bdfc2b1ddab4ee366c6bdcb8e1a661302c70b9f
font_01_sfnt_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 10856 bytes
SHA-256: c8cbe304bb07621cad5ae6ef1b22c3a6b68abf2d042a20a0ad2222c340b317af
font_02_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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