Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19f87d8298e76d7…

MALICIOUS

PDF

90.3 KB Created: 2021-07-02 03:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5749b82154bbbb790f72d776a52d75ce SHA-1: b1f73470003ae1fe3f8b0e1d5fbfdae2b1e9b286 SHA-256: e19f87d8298e76d72f4289d774b10b691354f6a729fc6e568aa9b9c10e7f9fbe
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=injection+moulding+quality+engineer+resume
    • http://3e-machinery.ru/app/webroot/filesfiles/jolofivisose.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c05d6fbff---92599759279.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/65r2d56rkqhttocn5osmkmgv03/sagelabokamobitorinosezat.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5495c4ddb---73659062904.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73dc6a5b2a---tizetikevugawofavekodugo.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27eaa5d0cd---66274120598.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d312595f28---gepigukogul.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad39f37035---lalezetifapomegeguma.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f298fce610---besobitewowixikomokidabum.pdf
    • http://files.ibiza-ferien.de/file/26972432597.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/budovirobopuf.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25cd192762---46565875287.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160999ff90b883---ketija.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c8bc65095---57387746028.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b13d3439670---67739532885.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160794bb2d8342---72700447104.pdf
    • http://rollfactorytogo.com/uploads/files/robotinav.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bc311157---lipovafiguk.pdf
    • http://ankurgroups.com/userfiles/file/gupuwivideduruguti.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9103d51ce2d4a17eb79265fc203032f3/26963022412.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f5c56bb9a534e39da9d74c28c5a7ea20/netulevuru.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f4b1875b---barazijizeg.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805064460a1---gajufadadolidi.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231199a11a---sobetewu.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_off0000fe1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 16792 bytes
font_01_sfnt_off00011634.bin
a6b697475ef37c610c65558d429fb22e44a218211067757b0801d22d17f154fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11634 11156 bytes
font_02_sfnt_off00012fb3.bin
af91201b413322546b5b706cadf1fdae14bda312bc61d986a56cec7a9f82cb76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB3 16968 bytes

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