Malicious PDF — malware analysis report

Static analysis result for SHA-256 e341de6d9ed2d5a5…

MALICIOUS

PDF

76.5 KB Created: 2021-09-28 00:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0dc2babbee65c953a73f7e71380c8724 SHA-1: 439020b87d19dfeaaef52451d45070cb80c11403 SHA-256: e341de6d9ed2d5a53802e86a018b5de5283c59aa7d160b4d826869256fd35a0f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, directing users to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URI heuristics and link farm indicators confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://coretry.ru/uplcv?utm_term=pixel+launcher+mod+android+10 PDF link annotation
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/40860855627.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/63673716825.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/fulilomel.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631931266.pdfIn PDF document text
    • http://nscenter.cn/upload/files/kulenivukimavozus.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/17251919097.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7027bea9b7d28db2ea1d42dd3c49ed91/jisinolotitukutiji.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/bupubamuke.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/53850632300.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/18309864452.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/zejawabaximomojalu.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/63767517196.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/7532454787.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/20739b2df78c631a8be82256c5919ad8/24827214974.pdfIn PDF document text
    • https://pokereshop.cz/data/file/gasazomisaref.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/85578760101.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/bagidizaxitiw.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/71738571466.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/gitixawemoxezurivimirafuv.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143866c68c0c---48233832650.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4077f417c---34345606434.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/5745631602.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/34526875877.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/bomuvakawilozesefupalo.pdfIn PDF document text
    • http://hocomesun.com/upload/vitotap.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_off0000bea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA4 10748 bytes
SHA-256: 0b54c6988e1e0c1be99220f766a6a68c7b48263c9208a0706fc47e221229e9d5
font_01_sfnt_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 20552 bytes
SHA-256: 7597cdebb0523e95c4936ca1634b596b5c9b2a1464e10307e2dc2a7281af91c9
font_02_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1