Malicious PDF — malware analysis report

Static analysis result for SHA-256 578f4f0963673ac1…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 00:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbea7b21f3cdfa2a83d1a33ad9d81ba1 SHA-1: 644c2f68d94c530a22ea65bacb4bde4783fb9475 SHA-256: 578f4f0963673ac1a33abe9324bb3a479b688793388a5fb47158046a8b709b20
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. The presence of multiple external URIs and the link farm structure suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://malbreil.com/userfiles/file/58571796770.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160741d2d91190---xitolegiwukojafoxa.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d77500ede---13242808999.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b80b1193---jeletosisoxe.pdfIn PDF document text
    • http://cocoal.com/uploads/file/94004274234.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608195749a98b---vakape.pdfIn PDF document text
    • http://rjt1.org/upload/files/91397327585.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/runogawuk.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/gulutenijejixuguvele.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b89e6a734---bodelakerarodikevaxi.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b536648c---rojuvuxadirufizefemibiwi.pdfIn PDF document text
    • http://liyangah.com/Upload/file/fesitamuxijiguwubi.pdfIn PDF document text
    • https://isosklo.cz./uploads/21825955719.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f165e7e5e---jumetejisaj.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/0s3knjo77um53898ir4kl7onn6/solomolofogosimam.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4d658ef24---40765302125.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7b9e67ac2---nelaxusanateb.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d43s4ps3v9tf89snkjc8p8uk30/51646410321.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14403406780.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jhfiuaad0j85u6vvlhvb6sjn1m/kinasale.pdfIn PDF document text
    • http://unityproductions.com/upload/files/86181270703.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/nipatulidel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=little+fighter+2+controls+pcPDF 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_off0000eac9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 16792 bytes
font_01_sfnt_off000102db.bin
26e12931985dc421969619598d719b4e3b6f1c0c91d4624631861f53b9510324		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 16948 bytes
font_02_sfnt_off00012ed9.bin
720d6f937ab415b804c0d88fedd0d6df23b7e9141d2f5babadbb89cd367e3c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED9 10672 bytes

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