Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d09802e2604e076…

MALICIOUS

PDF

90.2 KB Created: 2021-08-14 22:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c33a3028bdf34e8346263aa487581b3d SHA-1: e95cf69893c0c4f6a5ab1324919711cf53ba6178 SHA-256: 6d09802e2604e07696d64fc5cbadb9d2e6d64bf4cbd0b66bbc9396f37a3d07f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ketchas.ru/uplcv?utm_term=which+is+the+best+cards+against+humanity PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160917c73c23c5---37912085231.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/18342074500.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/89436578893.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f962b4fc39---tekofawilodag.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/74264377738.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/20b41a962f40b11b9547032fe26a50f2/kujoxowugobawitusuva.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/97273828d9c4be8f68186836cbc67901/19485113649.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e7543fb69cd3894076c87d803ec50c42/tufalapenumawuzelugibena.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/zitiwobemoragemalegeji.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/urn4tqgumn0umo952mnhib56k5/dasakiwonodar.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5984a68f9---84337568262.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16113eb3c4c907---fosumiziju.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/92364440844.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/68662085694.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/4k027bo4l8a3korltl1ieofroj/femenomozumumex.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fe5316f75---25364161388.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/85174527267.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lodiwowofi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a32ab0da497---vobafulenox.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/junuxogemepafumowagi.pdfIn PDF document text
    • http://fkhd.cz/data/img/99076509625.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/14678774960.pdfIn PDF document text
    • 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_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 17768 bytes
SHA-256: 6ccff814eb290df1a421ffe6950ba5c9336efe3f369875912b35ef44fa581ce4
font_01_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 11000 bytes
SHA-256: 50f4957cb8209f69e021d7d1a37c0aa8c369dffc2cb6cc2e77e31a0f2f1f9eb7
font_02_sfnt_off00014140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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