Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda9aa0fd7f2394f…

MALICIOUS

PDF

93.1 KB Created: 2021-09-21 07:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd0391fe5f08ee1d84f32021c8ecf7ff SHA-1: d1b3a34d4553534971a2384e60a92a20c41258b1 SHA-256: bda9aa0fd7f2394f0436659e47a225c2bb74c99505973bd25085a6d853a426e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised WordPress uploads. These elements suggest the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://aliceinformaticasrl.com/user/pages/sakuzupar.pdf In PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/84206943847.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134d38aca2ba---32697480345.pdfIn PDF document text
    • http://dongyuanxa.com/v15/Upload/file/20219211051472247.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/vibuxagom.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/6753866203.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613430cc078fb---67167029746.pdfIn PDF document text
    • http://seatraveltx.com/uploads/files/xekovamijut.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/vomakuwuwogorikivu.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/47733520498.pdfIn PDF document text
    • http://ingore.cn/upload/files/bifoxirafuwulosuj.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/jejoj.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/fujerowofuwiwi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/76rgbl9r4mce7or8kguluavd49/15802586384.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/vexefimigijipixupur.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c4293bbe6---9331767559.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/2589827627.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/busuxogezip.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/94772530271.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613672b8a288d---wubazikuwemisedukilati.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/fijazitezutewagufaxipezug.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/gakidatofim.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/lifozesusazanixuzub.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/pozoti.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/lativavuxan.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/61442820457.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/loxokufogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+road+to+character+david+brooks+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_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 19724 bytes
SHA-256: ea5c28a127a0cece514126c9b89ecd5d92c1b6014b7ebd0cdab56ab6e4cd4a10
font_01_sfnt_off0001359b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359B 10828 bytes
SHA-256: f7b0cf277dbda58b4a104b1b7f4429689f0bf7ca6676f1cfc2ea400dcc66c771
font_02_sfnt_off00014e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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