Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23de2ba3fe3f283…

MALICIOUS

PDF

103.4 KB Created: 2021-08-12 07:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db0824464295767cfe66527080d51413 SHA-1: fde6a004123bbae699be66bc22fb6ba7c945118f SHA-256: a23de2ba3fe3f2831d45bef86db16051d3942b1b974622746622f9d761ea26d5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely used to distribute phishing content or further malware payloads to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://oniceh.ru/uplcv?utm_term=examples+of+imagery+in+lord+of+the+flies+chapter+3 PDF link annotation
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/08bb54c6df9e16be3ae94424ad3239c7/fubawas.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/89167736867.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/guxuginibev.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zolukigeko.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ea59e4214efc14233304660cce90d310/pudabul.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/juroxuminomuxevemoberebi.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/60384141946.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea6659c28---35417309509.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/48488134565.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072f433b5fdb---24064605008.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/gamubomopowefa.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ddbcc0316---komotiropelogasutaw.pdfIn PDF document text
    • http://airfa.it/userfiles/file/dikewiful.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/defudofajomezomufoz.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1cbf92672331e1576abca82462e9b6e8/3722614687.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/xewiwamotozidozafuxemu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3gq3s0v01e4mokefqbr1pvl224/48358308474.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161129fdb987d1---78509707042.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/47c984e581585f44fe4edb581853e446/monapiz.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/812d72b2366d7ddc264c4b9c3c1b3395/bipudinup.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/dolimewukirexexoki.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/wedolizebigi.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/18771109295.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_off000130d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D3 11440 bytes
SHA-256: 5f5ad4bd692c1fa0d6b3eeeadd990a56886513512cb032d6793d5687013d9d25
font_01_sfnt_off00014b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16395 16852 bytes
SHA-256: 44e73840e7fcede5d101642405f5c7e3718ca58252607c0b391d4b3b7d704a22

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