Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd219e9511e38bf…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 01:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 977a5744ec28804dd10bda80f3a0f102 SHA-1: 9720ec9fed0f16cf132f3aa9a4311801a8725315 SHA-256: 8cd219e9511e38bffaa6b6d27a8646e3fb57f0b48863988f1e654ce7415b2331
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm suggests an attempt to direct users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://hmanagement.net/userfiles/file/kavadeva.pdf In PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/41d7237f3b9300e047afc255628043b7/fenanubasotunexef.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/10273696694.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/wifowodapumenelasalupasu.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/83470319990.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611868c9a386a---71055150707.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/14122375212.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/0m5df3cv3mavkd9csgnrsbk9tp/japafajaduzepemerewagal.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886f11363f4---ronisamejo.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/9297578907.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/35259499954.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3cd4d9c8c---misobabuxuwi.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/50950832219.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/donenajevaretejovuv.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/55bdd995ba6363ead15d0af95fb9a46d/33561691035.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062416512770554.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b9a00b75---nobegazesoworavevesu.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/52176146520.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/26435692588.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a05bcc695---sirexi.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/wofotajapigu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160978f1c2f2de---savutazukejimidetarepe.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf8ab3bc7---95447119863.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/82161641649.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/575903ccf39b9868c0a42283276a0128/76035685043.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/darevilewejomoxuvuzisivog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dedicatorias+para+trabajos+universitarios+grupales+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF95 11232 bytes
SHA-256: 6851176b3d1c00f53e02887afb4db3d99167ef2dd137d4dba1bbf29b8b7e13e3
font_01_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 17080 bytes
SHA-256: 17ab0ca8e22404697b8018cf0cc26c3436d0ce327ef96c9c77aefc8e2dad1ba2
font_02_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1