Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c5fa6cef07a468…

MALICIOUS

PDF

86.5 KB Created: 2021-07-16 20:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63bb4854ab91119d64da993ada6c3c7c SHA-1: 28b77cfc0f46124320f3f115e1c940364357a78c SHA-256: b5c5fa6cef07a468ef2ba777e1425f99d885f669b9e1aefe0f75a7fa10ce3ac4
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of multiple external URIs indicate it's likely part of a phishing campaign or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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://ibrahimkoc.com/images/Media/files/33204385426.pdf In PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/varuvijosusupusakin.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/fuzowola.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3m6r8n8drpeekvf3bddhqssleq/pasirolijex.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4803c8538---sotovumelotinifakorikisos.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/61955935666.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/torasunimipolotilikuko.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/50236335051.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/nedapikuzukobeborud.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608927b01506b---80555181187.pdfIn PDF document text
    • https://irantruck.ir/data/file/88295351815.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/53950209008.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4420e7086---70351415214.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a091c3dfafe---luvagivikovugewuwitu.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/gitetijipemado.pdfIn PDF document text
    • http://renovator.cz/files/file/92267645030.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/855647ddf4fb83a7861cf036703c3a88/77058750731.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/13362912294.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/12e8gm9gqbotpjfghktg7lddjq/7134527393.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63452b568a---vifexusojebuparesup.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d7c04abe---49109346951.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/selajuzitofuzoxodosebawi.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/zuwofejidiruki.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6cb7d7d0f090c3d3031f9b26d56606b1/84701049575.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/25700067186.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2550d3e3e---51531978949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=drinking+and+snoringPDF link annotation
    • 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_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 16424 bytes
SHA-256: 8e7ab65de3dddab8b40d82cdf4fef3ae252423b7b9f291933429a2b10b38ffe1
font_01_sfnt_off00011dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 10240 bytes
SHA-256: 3f4e63072bdd5dd51794d556bc25c512ebc6e374c665027c4cb844a16e886b8d
font_02_sfnt_off000134a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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