Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec47553e599d92f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 13:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05a9bdf7d267d9db31fc0aef63b25bfd SHA-1: 37f8ce7b85397e4f36494617c04b3f7ee5171019 SHA-256: 8ec47553e599d92f6eec3339ea21d5d879f16997fed9bf4f73c55d2d7c285f67
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=one+summer%27s+day+piano+sheet+music+pdf PDF link annotation
    • https://lecormier-menuiserie.com/www/upload/files/zorixodite.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/1473226671.pdfIn PDF document text
    • https://razredna-nastava.net/files/fubuxa.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/65233648365.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/nawuronerunizezubugosex.pdfIn PDF document text
    • https://computerzone.pk/file/99638933262.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/71161712869.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/219299c610f968cac873b6f569ce4dde/ropuxemutonobazuk.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///fikisisagetujatir.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131617bbf5ec---tedupekupoxelorebibu.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/77483715255.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/popepikako.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/lasedetel.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330df15afd1---66178799467.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///poserodikonixerovixeta.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/kovojex.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631425963.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/59476726722.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/39882096039.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161419b047f7ff---gamokusibesokez.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/44192680779.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/kidile.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/9850879164.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613726541b8cc---67953577670.pdfIn PDF document text
    • http://stonebreaker.at/sozedutudeke.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/94714993960.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/wedewurimosejelojoduvadik.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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 11112 bytes
SHA-256: 94890975787b1656c8925b9f90795a28b472daada62ea116ebf81999d9615eb2
font_02_sfnt_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 18816 bytes
SHA-256: 7fc9cd4c513b68d6b6c6e0505b2e724f73bfa73015a259bd4609092fc2dc72cb