Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f9889ef3fc1eb5…

MALICIOUS

PDF

86.3 KB Created: 2021-07-07 14:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ce76f2805da05bd3cbf1d00ac9f2f5e1 SHA-1: a9ef8a3d365ecc42700528e06e6894c58f431404 SHA-256: d6f9889ef3fc1eb5af166edc13a52a533510b14ca16b46307fc81ba945ea1ab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on distributing links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=time+complexity+build+heap PDF link annotation
    • http://tokyoracing.hu/userfiles/file/pazogakirebewoj.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/mizugube.pdfIn PDF document text
    • https://shidoremicrosys.com/media/85018884378.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/kenaditavev.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/totivakepofelufo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/caed4ee8d33e35540239583241b5310e/katisazurisixevemipufiguj.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90cf6a43b---xulevowulekilesulifajisek.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/kodekomaresejipewa.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077b833afbec---pebatetowapamebulumuzixoj.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ea75129528522858bdd6e4682325b6cd/54424209324.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/89763719129.pdfIn PDF document text
    • http://freeski.hu/freeski/file/19889982592.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/6crjb35tva92se087sfivbqikv/50200287763.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/mdcbibnlp9p5fqhauimsv52n4o/79892353955.pdfIn PDF document text
    • http://614move.com/clients/4890/File/fanexugiliwavegi.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/6600193410.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/16495183391.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/bunasebimudusunuge.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2172cce660---41778374697.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ad97740b---bodojanakez.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/selujuribilimevuseziwija.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/rovuretobapolemag.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/kuriwaronodaluwor.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55a512168---werobe.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_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 10828 bytes
SHA-256: 7af3d79a7e7bd6e1eca45a7fc520de201246ad01b24ea854b69a1e72d51fa50b
font_01_sfnt_off00010750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 17224 bytes
SHA-256: 9625cd31f8de13ec26037c234a81af45ac9215fc160c57d82e9e9623a13b18c7
font_02_sfnt_off000133d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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