Malicious PDF — malware analysis report

Static analysis result for SHA-256 2387b093a8fe7be6…

MALICIOUS

PDF

109.8 KB Created: 2021-06-27 09:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22039bf4dd2aeca3dd9f0c3e11bd64f5 SHA-1: 22cf1a37fe66d17393467aaba8dcd55d10bec0af SHA-256: 2387b093a8fe7be6ae50eb9fccf0a35e66f28780816f094ccdc49b1adffef306
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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 https://huntic.ru/uplcv?utm_term=home+invasion+films
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0c2f326c8---lorexufopukamijogiv.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a848a8b286f---70653481294.pdf
    • https://dolcezzecaffe.it/file/7797263161.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/60444155d4986e6af6c2cd7e493be5c9/70586841372.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6065613c94---mizimirurokewewaji.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608992054eed5---7883857700.pdf
    • http://cottoneauto.it/userfiles/files/79218240533.pdf
    • http://africa-emergence2019.com/userfiles/file/84752328673.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb2873d86---32340087074.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a693d53debe---29755966308.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/garufaluzipomuvu.pdf
    • http://cf-solutions.org/app/webroot/fckeditor/editor/filemanager/connectors/php/imgmedia/96906000506.pdf
    • http://nw-line.ru/generic/uploaded/60309510413.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c48d19126d0---37495305534.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/26505768171.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608378fc8c1a9---masupul.pdf
    • http://liccuza.ro/stiri_files/file/vuken.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gvf117js0e3eoav90n7sdmo4ot/35300484554.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/41538320864.pdf
    • http://monroehighwildcats.com/clients/40160/File/7237350675.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jetulogi.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/88db25fb56080f88b79f29b8f064d8a2/57874787899.pdf
    • http://newo.ru/files/files/wewuwuwatamilifelovedus.pdf
    • http://ciarajewellery.com/editor_upload/file/lawotafug.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/kitosanexitojafowip.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/kosuki.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c57.bin
e3e9b772711baf09c15f9487adab963276f9c5b0fe264ec27825e563b52d4b99
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C57 17868 bytes
font_01_sfnt_off00017ae9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE9 16792 bytes
font_02_sfnt_off00019300.bin
5df5f7077ceb5b89d8b048a9e93686ac44eb25309b556328fabf505ecd823e7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x19300 10232 bytes