Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6be0341aa79fc8…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 16:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 09135bd7c2d70ee7cdc0d9c2de8bf031 SHA-1: 616d4cb9fc15e24c129fdb656606cf8e1932c74f SHA-256: fb6be0341aa79fc800c5cd8e6e63c7faf2212cc6163bf0981c89129a8c0329ca
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to a variety of domains, many of which are identified as disposable hosting or compromised CMS upload locations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, but the structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=moldes+de+letras+para+imprimir+gratis+pdf PDF link annotation
    • http://freewest.at/48148687896.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/76008230676.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f834beb7c7---xinete.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/96355876581.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d798d9100---3191781491.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/24385108120.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/47bb21c2e4729e82aad2865defd3215b/tivuxeririsedomis.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/dibugivadomitar.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c45196b66---gomikimipikaman.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/tikigunav.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/ledaropelugeliw.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b15fa22c2522fab89471df9f8839b32d/kejub.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/srbosggnjgad6lqt0ooptm99r2/povamipebubijitufo.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/86164240766.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e7qp4eulqmiss0fvotb13ml0s/kupowadejomejinokefima.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/69411147218.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/45c886b3b349a97834d5e4dbc865c2cd/fosipivibubidiv.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210718_13022A1ABF50520D.pdfIn PDF document text
    • https://pellevah.com/upload/files/nozexabolelojuvuwubude.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3b86f00c92713609fadae238e3ee07f3/50196210020.pdfIn PDF document text
    • https://kopari.hu/files/file/jidaxisilomonumabuk.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/7296677961.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2779952b2---gimoxegurunugi.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210705074305.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bddcb6dae3---38461635308.pdfIn PDF document text
    • 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_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 17780 bytes
SHA-256: 435e6b4ce6bf4b0a44dfa2cfd0770a28880520115dee3fc3735f28fe3dcf6d68
font_01_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 10732 bytes
SHA-256: fa4581f0b5a0771a3441ae245c08a5058081b84d99282fa269ea23bbc9fccf5d
font_02_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1