Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5e0ad00d630ca6…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 15:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fef24252f7ce615fdd846a644fe71cdb SHA-1: d67f2c71dacf1ee6f2c7db92d275dfdf8049280f SHA-256: ae5e0ad00d630ca6af5e564c8eac42c8190f8b57f03894c75563c45defaec979
156 Risk Score

Malware Insights

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

The PDF contains a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links to PDF files on various domains suggests an attempt to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161335773e6d7a---1144186624.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5h93gvn8ibdq2mui8vvr2vsal9/defuzulupefimerobidotar.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/vatudoko.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/45661835841.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/fomowanebikotogati.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630872950.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/4127442431.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vepadunow.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/82778911902.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/voxarowipudalaruxi.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/fudapovupumegalapu.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/5065726462.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/61049262172.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/besosagazofafekijafaf.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/nejiriribokupovo.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/46835118827.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/7584907103.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613017f5862d5---38050894787.pdfIn PDF document text
    • http://full814.com/upload/files/fosomomamaxarax.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/reruvigoloxasiwujuleba.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/fuvapadodevewi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c4db1c326c529122efa9783545c73cad/88475235970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=plants+vs+zombies+game+free+download+for+windows+10PDF 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_off0000c583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC583 17092 bytes
SHA-256: f09d08f568ce15f0627f86a7ee43af15ced0acd7f2a2e7281b9d5cc89174b503
font_01_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 11224 bytes
SHA-256: 36ef0c4ecb83aaf86fe9b1d838891fab2db053259dce30846af661c580414580