Malicious PDF — malware analysis report

Static analysis result for SHA-256 4769d9f964af339a…

MALICIOUS

PDF

84.1 KB Created: 2021-08-20 00:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e1bac2b22001652bf08d26652145edf SHA-1: 8407ac0c1aa0d92e9c92a6efd777565374354534 SHA-256: 4769d9f964af339a446f6004e6484ebcac8a6cd5c34d598be1a5e5ac7e9fb481
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. These links are likely used to lure victims into phishing scams or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=place+value+4th+grade+games PDF link annotation
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/27535310789.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/kurajugawigekixo.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/17494739244.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/47beff338f525513502afaadd700b760/zititezokin.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f7d00cb1---zabixaratova.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a51ca578792ca9c04a948b870ef941b/zoxuwuzakulaxikazunalop.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34c74b7f2---jizujo.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/99620156196.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f2f23a9af---91063735754.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/96630716480.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/nifutibufebasinupoxu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdcfc25c1a---55631452878.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075f62bed465---fonilosuzesokipamur.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1edbabf3c---76321760344.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c72cda4384d---beseluxejakakiwudin.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c79d7cc77cf---gizijo.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/49587323354.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d88ffe86066---toxegola.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca0be8b23---43129236224.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/71608269003.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beb0cad5d07---gefig.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76d838fad0---72872020513.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f27a9c1a9---vetemanamulifoj.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/fukavibixok.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/19467506304.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/bagawiselirudusig.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_off0000e51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 10744 bytes
SHA-256: 08b20314ac659c6208808ad7b4b054d50080eb0aa4e68515c0905e6ac10290e7
font_01_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 17224 bytes
SHA-256: c44a3401e1cfd61da91c3b32b7bd9d9037030eb466903cbf8d5f7544e6174782
font_02_sfnt_off00012a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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