Malicious PDF — malware analysis report

Static analysis result for SHA-256 c587f8061c3e9e3d…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 04:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5e438efde25ebfa93fa1155271be27d SHA-1: 1c13ee178cad07b7720e0185b82daae73560ec0d SHA-256: c587f8061c3e9e3d050917d2633736bc9eb7784c7982230b385877bbdd80a267
96 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly suggests malicious intent, and the presence of external URIs points towards a potential phishing or malware distribution scheme. No scripts were extracted, but the structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=what+does+cpr+stand+for+in+business
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f7107a6ba7f587e6720d8a2bde52cdeb/73406196831.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/998eca9d63fe722b48c00b597f38ee13/soluzawisit.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/l7afej9av97ng144fngo06v2sq/55239356888.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/alqot5p0spiptm180p1qabo7la/38508393901.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/10804348469.pdf
    • https://dcoderesearch.com/uploads/79864317589.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/aec18c7bb8fabb7dd0c4cbf93b8e90d7/xukuba.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a9439a7d---lerilesuvef.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vg8o1c2d9o5hdrlnvnggd25glj/kidikabemelul.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502065806384320.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3608ee0ad---newumuvokutez.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4324a59f0---99080328501.pdf
    • http://jirehenl.com/userfiles/file/061332352627.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/svg1rpsuglilkg84u13al5tro2/68193568019.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ead330e09af790d8a0233ad541c2d42c/70965799364.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607385a23727b---ludobozikolajojuwiti.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e07882c681db83b48cad43e7e9f6c7ff/gipasanesa.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/dukugelejokajolisef.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/87340f22b9d5ffdaae51ebcef488134a/vupogazidujejenojadasuwo.pdf
    • http://gildiamasterov.ru/userfiles/file/13793487181.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080331799fba---fisofedibobumob.pdf
    • https://implant-drill.com/userfiles/file/kafubovimadejim.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5b0a85a54---91072332297.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/jsfr9obqopbap64ms2h0s7lc9k/70792417066.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_off0000ed32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 16792 bytes
font_01_sfnt_off00010549.bin
800a99f2dbccd6216404f0a98827470579d344a62d724a54d7ab45655c0743f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 10904 bytes
font_02_sfnt_off00011e42.bin
18ba3d3c922932969350b5d19abb2d37acdbb622fcbe5c439963feb9330e27bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 18180 bytes

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