Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b643a7b13589cac…

MALICIOUS

PDF

80.6 KB Created: 2021-07-15 09:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 97d641f9e34c3174dbc91c85f548b82e SHA-1: 8fd1c39f819aa4f639b11e0f3ea501581f246ac5 SHA-256: 4b643a7b13589cacf2f90d76b179f9fc18498ef63dc0a97652f201a53dacdfe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to lure users to malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the overall structure points to a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=2012+cadillac+cts+owners+manual+pdf PDF link annotation
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/webekegokazumadi.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/q55ie3dr8eii2svl52mqqhj0g7/rozavuvinepuribatidapama.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fujewadapozuz.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10e3a45261---zegupurawutotekokuleb.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16089f8fbea75d---6485489824.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210620_8FBCFF6C15D6DA9E.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160733bd7c23aa---62687232102.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/698849cd3bfe59b17f84754813cc16f3/40693142222.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/42944018684.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/vavorenezika.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/17496018616.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076acea1c15e---tovanuta.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc909e8a05---63086918940.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d7b3c1ab1314cc30b002a6b1ff74963c/57186520244.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/xezekimumo.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/fezidegelinabojesovasov.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607519c3ce007---tidofusubixedejejadimob.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/detenaliri.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/23911185343.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b486838de42---tisusikefeputakoxopoz.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b412c300378---53639611294.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/nhtvkrcgep66ehop3561nm61i6/juluxujomekidal.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/daduwexividoxifineje.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761afd7d470---pibavufujoroxejogodidali.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_off0000d580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 17308 bytes
SHA-256: a56f44bbf6e6f2de8ac8260d9171d2e3d208b7e794c6a0d641e4963594bb7de2
font_02_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 11164 bytes
SHA-256: e6ab2655ec9001bae95437c3450e003e1972e9016faefd5ba9afe2c1d6c763e5

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