Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91102f00bbe5f64…

MALICIOUS

PDF

90.1 KB Created: 2021-09-04 19:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7897ff0227229c09a268cf7721e6b9d SHA-1: 02fbc512094369641635719a9384e2f0528e545a SHA-256: f91102f00bbe5f64a0a2fffb744097c801f381c462a4417ad80e41c674ad21ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external URLs, some hosted on compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/imt8n50uc3jh5anhkkfa3u7t67/vikulisarogopava.pdf In PDF document text
    • http://toroisg.com/public/images/files/votilaxunivonuvef.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6deef577ef73236775c5158ff924fb45/sojaba.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/23102880650.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/32593720794.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/97704005795.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052501505696.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607078f98c63a---92143446013.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/39639250549.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/71712204881.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/9362353650.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcde1958af4---84845772798.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0adb37871b---29945638648.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/rukorinevitikow.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/tamoxupevafotomer.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/lotufedufezoviposol.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/wewurajejesapir.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/denuvobefemeparot.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/pimelenuf.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/57168220445.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/3319379c8a0709aba9f03b654539b984/57100766047.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/fofunavife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=el+discipulado+biblico+pdfPDF 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_off0000fab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 10404 bytes
SHA-256: ebf79a2374fdd3004ba4e6360b21e67827da389a00f2cdbdb877332dcdb63ea4
font_01_sfnt_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 19152 bytes
SHA-256: eb636f0945db4592b00408a726efb20e3081953e19ceaa81e70fba5470a50b07
font_02_sfnt_off000142ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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