Malicious PDF — malware analysis report

Static analysis result for SHA-256 259bf2e2a220e518…

MALICIOUS

PDF

97.3 KB Created: 2021-07-28 00:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 7fc21c8ef992488740514e24def2da04 SHA-1: bef1d671fa381873362b444148ac17368379fc1e SHA-256: 259bf2e2a220e5187a8b6f73e732e8bbe420191f66e366c272e05abcf926a61f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites, likely to distribute further malware or phishing content. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agrilaui.com/userfiles/file/naxidomulinimejilalegi.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/36309177493.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16094983ce973b---tusabeku.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8116532e6---72904411300.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/rerawawole.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/58833511920.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/vilulak.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a8795bfd---83496983913.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/je0tcl3o4tlk9e24g63r4d3p20/61505036174.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c20a32e76d8---nexazivogujis.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/kelaferalig.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/28955177880.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/47262c0ecf5da622010b454ea9a89814/tuwanidopusivujuzas.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609646a07f287---41935031428.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wosewikaf.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/nowatolodejovibalexo.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/wosojax.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/59e1b4adf429169a4b4d43ef17d7d6fd/19123376642.pdfIn PDF document text
    • https://cape-electronics.com/media/file/jizazajuxerun.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/g39dj1nqv307kb37ve8po8ese0/jukuxulabobosinelegulez.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/votametidaselelije.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/ladufalopesiduwifetur.pdfIn PDF document text
    • https://castel.ro/userfiles/file/totisipomadetisovedatim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+tekken+6+for+pc+highly+compressed+20mbPDF 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_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 2144 bytes
SHA-256: 15cf0eedff41921d6fa0017e7f7317768b104473f6d22aa261b335db870fe842
font_01_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 11912 bytes
SHA-256: 30fa0f5dba4899c152eef5f3dba7967583d25f200ea349a1855c28cad443507b
font_02_sfnt_off00012f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001475f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475F 17784 bytes
SHA-256: c35bd31608f0bc53519f8e51e06b90ab82905a626fae360442bad9eba8a942a4

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