Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aee3fbdf84c727c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 11:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc97bea1acb9c34685ea8d24626954e6 SHA-1: 787c5d55354f2ab5218ae8d31a61ec7c585a35b2 SHA-256: 6aee3fbdf84c727c49a5b59090df10ba940e31d7e0b3a7e10a0d65f559e6bef1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/64414629936.pdf In PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/eb598db236c510117ac763fe3ce5aaa4/sifobopamomaxevisus.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/76136694978.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b0f92c4ca74de41e5c24fe1cc56a38e/56717186233.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/744586845.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/mupusuriwelerolaxeninubaz.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/fumiluwu.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/26481158914.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/fotok.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/55745831891.pdfIn PDF document text
    • http://rc-modeller.se/images/file///wobazuniboxodakib.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/86e90fda534f5c85a13325f56fb15f72/tagikekodiro.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/rezimu.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/c40771948ade83f791b9e2a3c61e98ca/97244094873.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f92a0e2b58ec4dbeec424bd214b35dff/34282392496.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4f2dd8e51---78691453321.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/zusowefarav.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/kedojevimamotolovelorip.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/wigubopavetas.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/sugatolisuwuvodudote.pdfIn PDF document text
    • http://artospace.com/pics/file/dezijebufilotak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=7th+grade+social+studies+worksheets+with+answersPDF 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_off0000d15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 10880 bytes
SHA-256: c40808e409ff231bb5b75f2be66d693d16a8a3334a9cbbcdd385a347712e6923
font_01_sfnt_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 16860 bytes
SHA-256: c3e8b3a804ebaf3173c13427dc26314787a493ecd6cccfa225d2ee0e947316c9
font_02_sfnt_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1