Malicious PDF — malware analysis report

Static analysis result for SHA-256 26fcc5a663178a02…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 17:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23cd97dd1d12b7239d012a54d865f9c7 SHA-1: ef76ddf52702da96d1775893068c43cac32ed542 SHA-256: 26fcc5a663178a02350ede3baa1b54769a729a240ed1a65b5c2db95f86279849
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=snaptube+music+and+video PDF link annotation
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/taropijapuk.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/mobawudazodel.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/kalakupatavosi.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/weboremibejudufegisu.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/88665999185.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/dab8017ab84869e79cc089508817bd3c/nikodekon.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/74155213332.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/getefukixiranulomatipogub.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/20355925541.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c867befc---rejupurozotoda.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/tixenifupipo.pdfIn PDF document text
    • https://path.mn/userfiles/files/27874139320.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/wofoweramefopibek.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/fosekewaru.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/vejuledamigu.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/66932628437.pdfIn PDF document text
    • http://usagimatur.com/files/others/22222214319.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c60092a3e39735f69e6097f2a62eb1a7/27663809747.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/sapemew.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/pifevibegi.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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 10908 bytes
SHA-256: 04dfc3bcfd41660fdde7061ac8c7b57f6ee8459ef15a240795c7e32c31475a70
font_01_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 18248 bytes
SHA-256: fd18b6a48d532ff832698d1c437006f02946f92c3b2a8e97ce6876bdf98aff03
font_02_sfnt_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1