Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b79a25ed899033…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 05:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfc8b87536837ab4730e261613ce35be SHA-1: a9d0d31737dbf1784cc9becf48cbfa38acc1ef8c SHA-256: 65b79a25ed899033161f79f64c82f9cf722f4e4f6a84130af61ba93de45608ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The document body is unreadable, but the heuristics strongly indicate a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8bklaq76gpp7dhfq4er8649har/xinimoxetinowa.pdf In PDF document text
    • http://abwcrainhwy.com/uploads/files/1237373841.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/vafanaruvijaguluvi.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/16913320104.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sekisumotenabapakuluw.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/140101ca77de1bd1462374310433fad0/zonigidagusuxofotixoz.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/begolek.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/92553190456.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/67508363610.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12b79b8ae---53169652010.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tejebevumususoduge.pdfIn PDF document text
    • http://strandedtattoo.info/file/87066199376.pdfIn PDF document text
    • http://anm-av.de/uploads/files/laruvegafabiv.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362a2dab46e---77028602797.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/79127686047.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/kidig.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/41492661483.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/dagawoseki.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/35025455454.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/lepirapojanepu.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/26732822541.pdfIn PDF document text
    • http://rld-carbon.com/file/momokonejivaravugukosano.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/28152550944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+game+pigeon+on+androidPDF 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_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 16796 bytes
SHA-256: 8f0eae9ac8033bf0fefc226ec4c47d16c3c0d1ac2118cea9ad30b7f35eb3b602
font_01_sfnt_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 10596 bytes
SHA-256: 9ed43e389b6b7df3f2cb9d7929f59d68c518e8b6b50702b13605a48b9c430e8a