Malicious PDF — malware analysis report

Static analysis result for SHA-256 742d94e90eb4b81d…

MALICIOUS

PDF

89.0 KB Created: 2021-07-30 00:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9aed9de70dc7e97f5bf420be9ecd1311 SHA-1: ab534aeedf6ef4f74e3813e779213e3776b35096 SHA-256: 742d94e90eb4b81d8cbcf6ca8a33ca1a559b1e8769d11a9c98a761a994d1e0eb
156 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 disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or lead users to a phishing page. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/1fd768588dd81af5ad85d7bd5d59c278/93817223253.pdf In PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/eb713db0d8f8fa1b414e126383b18b0f/39331304338.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3441fea9c3c6fcf69c94b0b273dc3e97/tumofezomu.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982559b7761---25277548172.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/19645333181.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/97997124906.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cd0d07b68c35984c701494b1fc955d38/xituwudumosirimuv.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/87634427579.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbd9c8c20---gudozekom.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/bafobeza.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5a207c60e---pusavipegedisonafif.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/kazuributinokedig.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/9a2cd52f5dc19da81511c5bc67fb71b5/1299235044.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/modabewig.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/94056305628.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076aea98add0---17255276365.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/bivadinojibelimolara.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/kizasadotumafuwizani.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/bazupizofamiva.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983daed0831---rajogipobeporazijoxegox.pdfIn PDF document text
    • http://plncse.hu/php_data/file/lunijap.pdfIn PDF document text
    • http://inistor.com/ufiles/files/33643543659.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7c5f7d64c---sevumemopo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/993abcc60a2f48e890d27eed289ecdc6/20562799324.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/27380580066.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/loxepafevax.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/o4519r9hj2qklrao4ec5f275t6/85589293356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=contabilidad+financiera+carl+warren+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 17476 bytes
SHA-256: 101e6def6d07f0b5ea64ac20106d389f806d65be07603924988d351ce1403d42
font_03_sfnt_off00013b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8E 10700 bytes
SHA-256: fb499d9e0e53f014706331393ffdd3f17a5a79c09210dc685cb1fa02de96bd32

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