Malicious PDF — malware analysis report

Static analysis result for SHA-256 b300e950592c2b7a…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 06:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1897e4b63c8176638188ff0491878155 SHA-1: 607919462818f465dc71e60838f761fa2e65937c SHA-256: b300e950592c2b7a4e11e49f736f7ac579727971e916a7953516ce51bbcd65df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting numerous PDFs on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://nawaress.com/webroot/js/ckfinder/userfiles/files/8158501529.pdf In PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/47032186093.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/42808061270.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/99067076782.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/gijelawopadubafasu.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/pimapivovigopelane.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/bifiwakanusid.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161539233b26b6---vuruwexuvo.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/43213486509.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/85935761847.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/12757192553.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/m75cp5mqs4k4vamprmk4aonr02/85695386063.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613491aec6c43---biruvexexataxubifexop.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/53735931283.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/vokosisajugeximikejuforu.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/bufekoregidejatemal.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/golobuleg.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16142702290f8c---9246879925.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///2439851900.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161495848a88ce---xogoromewovuxibuk.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901185644_tmhwue.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=material+design+standardsPDF 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_off0000ac5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5F 10296 bytes
SHA-256: 8ac2b634cbdb5df6e90d78c414d0111fdf9f7633005fd58011d4384bedee78f8
font_01_sfnt_off0000c36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36A 15464 bytes
SHA-256: 74f5ed613b820b1c9ac3aee6019a5d26a174c0986fd054a9664b7e7586c2a186
font_02_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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