Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd98b4fe3583478…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 22:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 643c3fd6550beb32bb3dfdcc9586e99d SHA-1: b94e5b22e2b939cd06b5f358825a36c4e5e86794 SHA-256: fbd98b4fe35834781c807da634ed0591592e8101f786e9ff5fa1d348244371ba
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a 'Browser extension / update installation lure' heuristic, indicating a social engineering attempt to trick the user into installing unwanted software. Multiple URLs are present, some pointing to compromised CMS upload storage, suggesting a distribution mechanism for malicious content. No scripts were extracted, but the overall pattern suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://systematix.pl/userfiles/file/25669205074.pdf In PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/22915674768.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/45154482329.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e09d956449---vopefabuvemosogudan.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16143326b1c07c---nalilerawopidivagitufego.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613516b155fc6---bokitalumepaz.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/savupagavufa.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/roroxilesetopobubi.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///28931030280.pdfIn PDF document text
    • http://lecostationery.com/files/file/7939607732.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/vutosemeje.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/95622017231.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/43049358272.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/14770828893.pdfIn PDF document text
    • https://superpart.com/files/fodis.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/18538771598.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/11140036698.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/86229919788.pdfIn PDF document text
    • http://gaudi.tw/upload/files/79564309056.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19f9cf82a---68002685336.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/84112517454.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ffbee85d80c01cd5a1ddf8b0445f03e6/valulezulelijuw.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47db20513---sabepixelofofudobebirox.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/97366339273.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/9307066774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sites+for+free+robuxPDF 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_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 10312 bytes
SHA-256: dfc46f39b0526dc328fa583eafd5b367a6266b081ed44b6e250ab7acece2a331
font_02_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 18044 bytes
SHA-256: b88bcea7125ca0581eb7cbd626562b7abdb0a6e90758d1a09c2d94dc90047d75

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