Malicious PDF — malware analysis report

Static analysis result for SHA-256 581275be7aa010ec…

MALICIOUS

PDF

91.6 KB Created: 2021-07-03 06:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca5a94629e760b39f0da211ea3141142 SHA-1: 9171d9a64b294c81b6647696b604010adfd57d8b SHA-256: 581275be7aa010ece0707c7898f0e82bd2707466b6a5d88fd85ceb7366a5a740
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The document's structure suggests it's designed to redirect users to potentially harmful content or facilitate SEO spam, rather than deliver a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc20a391599---25639431526.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607166c59d94e---14112989543.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d1f057ad6e6d830c0ebd89886899e340/vanekazuderapol.pdf
    • http://sun-eko.eu/files/file/97439705559.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/3lp48510e61chuarf7vrvloqb8/89805449410.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724cb1c7d7b---2332722145.pdf
    • https://ipic.vn/userfiles/file/kidurevuzenebazem.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796e1f84b5e---53940584310.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fb2279019cec7c5b3b8c877de11ab8b5/ninotadukelagekelasugi.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1f421deb06d5cac097ef708dd87fe4a2/7373971750.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/xebetugopiwimigizeri.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/08hr99240bucobo2krmgk7ec8f/xuluzexulowem.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd1501e822---guxokegaka.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ad9127a4---48516909354.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff09434e0c---razewizakowafoxiva.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739aaa95727---bezekumewuvosagitosewunaz.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607828a67a80f---xalakurowigilokopodebexe.pdf
    • http://gorisum.net/fckeditor/upload_file/file/26569502221.pdf
    • http://dmkaudit.sk/101/upload/file/molulenojajixavotiresij.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c182265eeb---leladafumozivo.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce73b347b---65439820009.pdf
    • https://mollis.rs//files/kubepilofokajiwuvoxojam.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/d03c996bdfc4ef50c5caf80efc2c90d0/begenurefakiporotogaj.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ea3b3b7d53976422e4715498d9c6f9a8/zifarudi.pdf
    • http://kayapaliinsaat.net/file/27074236865.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=our+environment+class+10+mcq+test
    • 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_off0001001a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 16792 bytes
font_01_sfnt_off0001182c.bin
c4f5a5609b383f64138d10d9ec8a95b2c835a3854919d55bc560c1bc84de04d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1182C 18072 bytes
font_02_sfnt_off000147a4.bin
abb966bb395e5afdac9256991376448bb7ea5e38263bebd36862a61c8f756d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147A4 10900 bytes

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