Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce932c475ea69500…

MALICIOUS

PDF

68.2 KB Created: 2021-09-29 01:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 099adc5b0104e37a368e81aabf4e115d SHA-1: aef0a9e0571ce4c907417baea4a599f37ee7dc90 SHA-256: ce932c475ea69500cc63f9b79e6e495df680f35028466e55aad63a787b2f1f30
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be disposable or associated with compromised CMS uploads. Heuristics indicate this PDF is a link farm, likely intended to manipulate search engine results or redirect users to malicious sites. The ML classifier strongly supports a malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=seo+suggestion+tool
    • https://vokalensemble-vocembalo.ch/userfiles/file/56875831420.pdf
    • https://sibconsulting.com/contents/files/munifazo.pdf
    • https://ibericadearmerias.com/file/vogaxal.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8f739db8f---wewul.pdf
    • https://magnettoptan.com/upload/ckfinder/files/karadapuwufupixobiset.pdf
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/33626634444.pdf
    • https://foodthings.us/userfiles/file/48457160643.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/20183124117.pdf
    • http://hig-hegmann.de/userfiles/file/71070999558.pdf
    • http://stefani.cz/fck/file/wisurag.pdf
    • http://delta-serwis.pl/pliki/zupijunavaso.pdf
    • https://hyosung-gulf.com/uploads/file/zuzetinomofilifodexumit.pdf
    • https://tselectromechanical.com/uploads/CKfiles/files/mowuninas.pdf
    • http://seattlebestteriyaki.com/uploads/files/16788949198.pdf
    • https://kattliv.com/kattliv/admin/userfiles/file/27889887594.pdf
    • http://asupuro.com/user_data/image/file/46239151005.pdf
    • https://hotel-la-licorne.fr/userfiles/file/nuzamegerusejosefafa.pdf
    • http://hissekurban.com/resimler/files/37820244119.pdf
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/fifugejazu.pdf
    • http://kor-ra.ru/UserFiles/file/mofetoj.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1d11d728f6cda4d433ac9f22b4f2f26d/20564141941.pdf
    • https://abhrian.com/userfiles/files/fikiwotubaripek.pdf
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/pepaxi.pdf
    • http://xetaihyundai.net/upload/files/70558393855.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130202f22419---joxipuxebemawunuvuleda.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_off0000aff2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF2 16792 bytes
font_01_sfnt_off0000c809.bin
eaa56d0f703e48c4a2d0dc6694b87b4d8f0660e7a09b4b04247e02a079e3322c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 10196 bytes
font_02_sfnt_off0000defc.bin
cd49f477e0423b55c74606ed35b438517d7ff25f7fc72406a6d8a9dd105fd499		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 14708 bytes

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