Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e925e03db13428d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-13 17:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21b9b4c1b06b1d78d0a7188e7125ae86 SHA-1: 500f8232948b34d266092eebc5785885565bbf2f SHA-256: 7e925e03db13428d338d62dd649320e81480ed5cde26d7e189aa536816dddc5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories or disposable hosting. The links are designed to trick users into downloading further malicious content, as indicated by the 'utm_term' parameter suggesting a download lure. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=download+ps+cc+2019+android PDF link annotation
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/16094128300.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/4791416076.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/wizezonasivopizof.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210904_9820E3187FC49886.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/robotabatetenuxog.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/79131563799.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613318ef4ecaa---23342991222.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/zujexe.pdfIn PDF document text
    • http://tdbm.vn/upload/files/netufel.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb14b4b5be---doverixoxubawenajizaguxu.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/45894086124.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45e61dbd6---refavowizaxakatepogufat.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109041050507586.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb711dc4f7---vogizalidiluvikezisoj.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/zasorizoponetunifugupa.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16136c589459bf---91601760042.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/fijur.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/dasopirigob.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/wuvoz.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/23591208453.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/81756943760.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d47918053e5defff9d77b2137633fbef/lunerolaxetuputonito.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_off0000ba4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4B 10828 bytes
SHA-256: f9166d00f924c54d3e4be7eb72b66787fb0f2326a19db291f85c7d1242f67bdc
font_01_sfnt_off0000d37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 16284 bytes
SHA-256: 4796c4dd0b3859720a02a17ea82911e9c28f7cb2ad174718bcd6aabffecadc7f

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