Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a0af1ceed01d58…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 00:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbe8e87a205012fe230d0c0fb77ce860 SHA-1: 874813215aa459dfb3da667a7b8b6ea3e435f346 SHA-256: 59a0af1ceed01d5827e05902591a9b8a4944f5f74c330f717f9d2847304a02f9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely to host malicious content or facilitate phishing. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://chcial.ru/uplcv?utm_term=heating+up+rice PDF link annotation
    • http://sugarfree-gelato.com/upload/file/69915884597.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/vowetagevafin.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/rodukupogefuwokivuxufero.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/bikenuderegejagabazuzowep.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd3c98580---xexonojotutid.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75326ec44---75632257324.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/nudazilenurojuxufi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c240c6b22be---3357422942.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c78ea2d49c---sogibawalepuxezobezoval.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/kunokugevuxam.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607026a162164---xalunugokomoduxarasawaze.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b6f8f210---bawebaropexagu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/53c35a4fe85247485422307ce7e48981/tisugedigofal.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf276058db---votoxivufotefug.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a814aa3954c---46862185237.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/11304630800.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/wefibudaxurema.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/wikozox.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081385895b30---lopejapatoralidev.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608099db619fd---jonados.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/73989790398.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/60563782412.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/belobezogebenibozikedupe.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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 10304 bytes
SHA-256: 60c1853e1818411cccf6965adfae5f04f6829d34acfb0da1735df3c2bd5c50cf
font_01_sfnt_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10850 17020 bytes
SHA-256: f1e5fdec7aba9270954098a53977495999ef3e4e1cd8ba5651803d5908c26733