Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a53a51147af64d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 21:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 711e08e5a40cc6bd85180e5e7f63134e SHA-1: ca45c0c067e27827146a0eec765fca9e866a43cd SHA-256: 95a53a51147af64d6f1c80c6967fa80868359bf5e500e9ec795d159ef3190c7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress upload directories. The embedded JavaScript likely facilitates the redirection or further malicious activity initiated by these links. The primary attack pattern appears to be a link farm designed to direct users to potentially malicious or phishing content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=best+dark+theme+for+android PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134303362591---dibasisusu.pdfIn PDF document text
    • https://ptogel2.com/contents/files/lusolonibopajivijaterep.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/nowubadibodu.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/1855802680.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ff69f3223b999797a2f00aa6279d1e0a/38567628463.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/11017353263.pdfIn PDF document text
    • http://bingsu.ir/cache/fck_files/file/63639153812.pdfIn PDF document text
    • http://hkalc.com/userfiles/kegibemaliwonase.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b482a0b7b---joxizareg.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/lekogusezabo.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/lomizapubuvum.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/vozebumodegirimo.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/zesajiropuk.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/14214851981.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/87593332039.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/demubixale.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d18294fb1---95799113797.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/mudedit.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/jugamelekisinagej.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16147efeb033c8---54641949669.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/10722783765.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/3441948990.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16148899e40bb9---mugajuvebaxig.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/24773760007.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614db4d1d76f5---fupepepalejufinubabuwiwun.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_off0000b3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C7 14984 bytes
SHA-256: 048ecdb21a48082474c71d52b2e5a5de06e0c6252a0136dc8ef67e8c28647f46
font_01_sfnt_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 10720 bytes
SHA-256: 3a81bf29fc7a54caf5eec72d0301b1a1a0169101de152a2eff3d4239d57e4e98
font_02_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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