Malicious PDF — malware analysis report

Static analysis result for SHA-256 146abb9a971f56dd…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 06:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3b31656838562340d2a42ee6fcb01597 SHA-1: f4b6ef6d05e5a13a94e60ee51ca3fbe12713545f SHA-256: 146abb9a971f56ddb7ec15d5131c4b4f3843a5d4d47c18457dc0e41ddb0c6f26
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other domains, likely intended to lure users to malicious content or facilitate SEO poisoning. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised upload directories supports this assessment. No scripts were extracted, but the structure itself is indicative of a malicious distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maudchristan.nl/ckfinder/userfiles/files/bolos.pdf In PDF document text
    • http://nissanotogovap.com/uploads/images/files/99379670543.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/fijaduwex.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc847ca0fc---favezowu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071d4a172749---90061295394.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611e6571c5265---xewasekevejademanaridu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160997aa7bcdc1---17978538740.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/poratinum.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d827418adbd90a55b4a2f519dc19b47d/zawenixalakuw.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/83144290496.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/dijijizasukuxaf.pdfIn PDF document text
    • https://chv.vn/userfiles/file/51869964792.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c30e2444b48---55904377732.pdfIn PDF document text
    • http://wych123.com/upload/files/5469079170.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/gikasukupe.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721f10c94db---740274718.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/46314508226.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16098595ddff8b---41189474113.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/pitotevadisofapuza.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/34803462127.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/gomuxaguxaxafoza.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/laluxekovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pirates+of+the+caribbean+piano+tutorial+easyPDF link annotation
    • 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_off0000c977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 10932 bytes
SHA-256: e3a468de3676a4a3d2fbdd79caed29a8e08e65aebdef82d75d89bac249a30cc5
font_01_sfnt_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 17888 bytes
SHA-256: b86615d33dcf84964e7710946fc731646360bab2927876506e03ed59786991ad

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