Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef357aac150ee27…

MALICIOUS

PDF

73.8 KB Created: 2021-09-21 03:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f92d2da7de25ff29b18a9bc596e974f3 SHA-1: 4f82eab6724f037bc531cdaa405379376fe33aa8 SHA-256: 4ef357aac150ee273d6d41a887e8be437dc33c86878710059127370a4c83087f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for phishing or further exploitation. The presence of a link farm on disposable hosting and compromised CMS uploads suggests a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=demon+slayer+full+movie+online PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138590236fe3---1436683815.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/sezaxiwefimefedubovit.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec315c6476---mefujobafuvaxixewulad.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/47566614598.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/xekodok.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16149253895ab4---17942267193.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613757623fba2---gavilo.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/62883924016.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v2oiihfrl1obh5ldi7pfm0itj2/zukapij.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/69184842551.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614866bb41613---86091307799.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/waxotajube.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/liginozinuxateti.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/pebujivapepifopidojeju.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/24686518436.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/tulazonotakimijebiju.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/mojevekegatebeloneduzod.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/tuposinezexikotepuxif.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/lunirel.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/kopevowiv.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/8493319357.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/eeb688a91122387927c0a08192132a8b/80922824552.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/91242477873.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_off0000bc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 10560 bytes
SHA-256: 68f46a8cb4d769bc413cff8a3ac045e90ac97c609be7dfafbb29e4500e3cde1b
font_02_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 17648 bytes
SHA-256: daccc6945aa96a000b2339c3c9040f81ef67a665f12df2f6fdbb6fb7aaeacd6a

Open this report in the interactive analyzer, or submit your own file for analysis.