Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f707059905d977…

MALICIOUS

PDF

81.9 KB Created: 2021-08-24 22:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76d4281ca1caffb0a5556e041677b836 SHA-1: 1a5492cc582a62e8ae486223d4eac025938c7db7 SHA-256: 07f707059905d977c732c3984401089bc41aae2a2d1379a8954ed95fed141335
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive URL usage are consistent with techniques used to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://infrive.ru/uplcv?utm_term=acting+lesson+plans PDF link annotation
    • http://multi-accueil.fr/ressource/site-image/files/356002093.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/sizaka.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/84573278023.pdfIn PDF document text
    • https://shopabrang.com/images/files/90626759402.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/xaxofesumot.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/72038923063.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/k03h4dii9eu29dgmpncpvvfar4/80808718832.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/feee0c9f1b52e2f44ca946591bb9ae88/zutuxinuxibimuwo.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/luworetexixo.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/pikewodinigatotuwijawabox.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/14455185288.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/94200970355.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/32430666282.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/tulukuvete.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c31c382ab---gavojokixuval.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/77339658444.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/53d39c0935158bb9bf0fd03602b3b895/sitebev.pdfIn PDF document text
    • https://ultralloy.net/upload/files/75945556321.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b455778df28---66830755106.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/zalovo.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c9cbf7935acb1b88b3a8f19fa5337dbf/toduwumanozi.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_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 10432 bytes
SHA-256: b80849cffc58be8b1e656209b7996f6a79d4d86b47618a128459592c2e58b127
font_01_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 17368 bytes
SHA-256: 943ba3cbe9d45e1ab75e2327ca12e3f12c86e7e050f6733c85d15c967122a3de
font_02_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1