Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6332e49e6c7389…

MALICIOUS

PDF

68.8 KB Created: 2021-09-30 16:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0002879cb85efb4b828d7618214a8e15 SHA-1: 3260b4604f496855dfedb9c872d73ee031a04b2f SHA-256: 1a6332e49e6c73897712f294882b9ac9d3888adf016099666ca7a4e06c00d50f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick the user into downloading a secondary payload. The primary attack pattern involves spearphishing via an attachment, leading the user to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://master-sign.ru/ckfinder/userfiles/files/dopixoxigi.pdf In PDF document text
    • http://vollaracis.com/UserFiles/file/39879441155.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16305537966312.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/mojidisukixamow.pdfIn PDF document text
    • http://matras-devison.com/upload/file/wikenolinopinuxido.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/xavuzegigepukadadofirozu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe6a8d43f5---futagebases.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/19999531395.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143938d018aa---rabikuletobapuxozomafetol.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/80792463508.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/807ef18a85aa96b265a0a69e298f4022/vufakarat.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/gakoluzutironezolezub.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/mubuxefel.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/golujuwokat.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/24042072715.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/wesobebi.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/budego.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/63732409857.pdfIn PDF document text
    • https://citronel.com/userfiles/files/57701128297.pdfIn PDF document text
    • http://lulanjina.net/upload/files/60348594142.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/xebututerifuzuxuzu.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/vazulukotej.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b9be7efb4dfef0a5f0b2a65b40c87696/58224738093.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/beguxusowizakixune.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/kobowedoselorazaxalad.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/32496863825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=qt+desktop+application+examplePDF 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_off0000af7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7D 14684 bytes
SHA-256: 7c5b83c1775129ba45e77e7a6032b9ec57c09b108c3e337f6763c99c84b5a010
font_01_sfnt_off0000d454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 10828 bytes
SHA-256: a1338f2f337d840aa8a49b891059cee81ccef14c870dab528706b06827c45f44

Open this report in the interactive analyzer, or submit your own file for analysis.