Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a5f8f69c212b26…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 19:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cc89187d6cc9818210deda20066effd SHA-1: e84fd8664c2a8d09be43b9ab2e6d6f637683735f SHA-256: c6a5f8f69c212b26545676a84a35e5b7a4c547f731f37d89f1048f3b8caa348e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://nickels.design/ckfinder/userfiles/files/58867301322.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421b0c19b91---21533199461.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/tejajomi.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/68337566404.pdfIn PDF document text
    • http://pi-consulting.ch/download/78266085447.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/29610792675.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/56052903427.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/jarozizenajewakekusolu.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/13668320381.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/volawonugifejamefudavu.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/81567358252.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/bogufesivuxariwelutego.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/nopoloduwipupasokuzokik.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/nudiparilakepewanewudof.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/36661676434.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/monuwawul.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/sobubesuzej.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/lovafaxu.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/bubajobinuvemotiropaga.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/zarirefefofevowogip.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614100e180d13---fanetanisawuzetino.pdfIn PDF document text
    • https://rinducm1.com/contents/files/44055225327.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/jg1kt65e37m2ba8kkkfddk4p60/58837225453.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/22930437561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=filelinked+on+firestickPDF 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_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 10376 bytes
SHA-256: d0844ad9679740e40c5df7d034ea59124b6fcf5c381bbc9114fa24adee542a03
font_02_sfnt_off00011c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C39 19144 bytes
SHA-256: b048a46332998b447f076b89eb7901f1bee234ee1a0f6cfedbb157141f936bc4

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