Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a4150752dfcd66…

MALICIOUS

PDF

102.1 KB Created: 2021-08-10 22:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 205624af31744b9a73ced02e7c5f0070 SHA-1: 90711ee11db623f99e1ed4a100fa4cb81d07ef7a SHA-256: a5a4150752dfcd66fc03ff720e2adf1c12e803e6d74a3b8e36bfc43c18fd2f45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites and potentially phishing domains, disguised as IELTS essay samples. The presence of numerous external URIs and link farm heuristics strongly suggests a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ketchas.ru/uplcv?utm_term=ielts+essay+samples+band+9+pdf+task+1 PDF link annotation
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/fuj24bfos20cr8hdos14s4nd54/85624735639.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161000ad7837e4---42528196222.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2e65183a4bb737bec751c21066117f26/62727843619.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607660824ab02---22538217876.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160853db11f620---60630907243.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/0c8ksik8clcku3q80hvcg4co6s/63519823959.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/fasewifodolupegakinifobo.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/gezokomoxapijituvevofaf.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c575032f5a1bdf6b626962d6f322f628/basevigefezuwumuvuni.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/25624070064.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/2021631002.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/66137894887.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/geguropomoma.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289c8f20ed---gimejela.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f0cd5285eb2b3e464b6d07e5a78a20d7/63307521184.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/4h7unofom6chkpo2vcja64r5cd/jikukilufolalaxilatikez.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099942f4fada---54881260853.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b1d9362d3---19638257454.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/samon.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/49fbc0b3067b6295095c2af29d105908/27943643073.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/veram.pdfIn PDF document text
    • http://techbis.pl/files/file/13711892262.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/2496793375.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/31507685288.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/kevib.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_off00012b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B25 17420 bytes
SHA-256: e126f780e0c94e444ba0534a3536e4ba330c7b02a2603f10896097ef7f96fd9c
font_01_sfnt_off00015864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001707b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1707B 10864 bytes
SHA-256: 6870b2fabd0e3f9c70359c519a74f97c1b9b6baa36147b1f13d0d088c61b2bec

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