Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eac56a087ab0146…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 23:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 454772ac8a36b57d6e6f85ce7ed60f79 SHA-1: 9b37bfefbd13cceb54ff386d7d1778f0c6d15254 SHA-256: 9eac56a087ab014608059da16696e9ad15ce8159cc28b50b3dd3dbd26d8f3e9b
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 within documents. The numerous external URLs, many pointing to compromised WordPress sites, suggest a link farm designed to redirect users to phishing or malware distribution pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=streaming+app+for+firestick PDF link annotation
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423196dd947---lawilozew.pdfIn PDF document text
    • http://thevalleytrader.com/files/nodumitifisupuba.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/besabokajapizadaligobu.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/solovedibipigasan.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/7dc6c320d568413f1d453336acab3b34/dojusetuki.pdfIn PDF document text
    • http://www.toptehnik.si/images/62068259503.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613991d6652db---1418235269.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/muwawowig.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/kabawededopi.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/gixop.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/tawutokekesedesebebunu.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/safomotilugepitijejuvez.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210914172644.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/76175822668.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ni3so8nmlf6fatqsujrvpi7kn6/38930116334.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/35360042581.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/71242048242.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mikega.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-18/20210918212656506531.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/5828847978.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/21993698299.pdfIn PDF document text
    • https://31app.com/userfiles/file/48250315162.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/17267032229.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/2599678281.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_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 17856 bytes
SHA-256: c6e3af199a90f21f3c895b75045fa7bf2efe5d4de73962f645e39c0d1a68c2c6
font_01_sfnt_off00011a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001321d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321D 10944 bytes
SHA-256: 04441eab973f2a9f7ddb06412b8e5c711b035241be99d7b4556e06b8f962eda5

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