Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde5db6f2c3f574e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 12:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c2765c1a9159202e528531b08e928d3 SHA-1: a41984f4ebcb40a6a844dae5281820a3b745c4fc SHA-256: fde5db6f2c3f574ec804be212346ff1f0a954ca8363047aae01ed01b94090aac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and numerous external links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323eea66cbf---47858092994.pdf In PDF document text
    • http://suliaok.com/v15/Upload/file/2021981812328905.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/67216370525.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/59179689008.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378322b5420---11835497125.pdfIn PDF document text
    • http://youil.org/userData/board/file/dodegapedagenumi.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/91faab8966926eeaa7d01e96b6c501c9/95104930090.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/41324701635.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/78452400678.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/8230668109.pdfIn PDF document text
    • https://masihpt2.com/contents/files/fuzegozafutimonebikumak.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/bawazatawebogubizaxo.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/27772709002.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/11082249504.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/nolisujagitezezoja.pdfIn PDF document text
    • http://plise.org/userfiles/file/52153043332.pdfIn PDF document text
    • http://flexa.cz/docs/file/kugafujevejimijesi.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/baxudukiroz.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/rizikefatubu.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/7291791867.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/tezesilajoziv.pdfIn PDF document text
    • https://parfumzone.ro/files/file/41297956088.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/61566373439.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/majinarezuwilijudaxo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161392d60a7b13---nopariravolum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ps+cc+apkPDF 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_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 18592 bytes
SHA-256: 2605acb676ea9f627e8b579e2e2dfd39e424e1c36d14cbe6db18bc67dcb20f32
font_01_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 9768 bytes
SHA-256: e9beb499be0824997bd85d14fe8e5c4b326dba3c92dae5571aabc42c3c683262
font_02_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1