Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc95d957a2b1a20…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 05:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1e6d22cd4f3f2aef48eb2bc10483f6d5 SHA-1: f5822337bd8b3937bd23db9ee371b84f3f0fcb47 SHA-256: 4dc95d957a2b1a20dd802bc613cbe3f60e80dc1fb7147e872665df9c484a921d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://usarsenal.it/userfiles/files/wunomekafobopumomovulez.pdf In PDF document text
    • https://computerzone.pk/file/44296821725.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/91664419179.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/95aaaf8b585373ea704bde6841cbee95/loxeloxovagutewatizovi.pdfIn PDF document text
    • http://mutitar.com/user_img/files/nisovamuduxu.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/riruxawivalusizubujo.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kegudananezizi.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/asuaidjndhu53t31apcejja86g/fabexemukejefe.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/zowalonafesinif.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/bezirugazovadapapizol.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160710d61379b0---28361571084.pdfIn PDF document text
    • https://anakmeong.com/contents//files/17566809639.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a663c149bd0---84340869763.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f641ca4931---xupapivesaratujagemonaw.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b84f5f20d---55047182476.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b203fc732c2---pezigoti.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/l8cq7kf5rfaqjunh1i1kobokcb/38178924453.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/4252d5a3fc6bbf8cccd9e02459156007/45463447852.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a58c16350d9---dagoru.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed19097f7d---74209327958.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/a6763c0af8a40fed510a95a19c6f5ef5/1386848309.pdfIn PDF document text
    • https://umartravel.com/files/gowekafafurefujamu.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/smh8nivek5k177hh4kfftv2ef0/sitolorimir.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/wizesidoxu.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/akivegaw.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/21720849022.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807715d77a0---fedoxoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=export+of+spices+from+india+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_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 17504 bytes
SHA-256: 0d0bd2e9d764a572c7afb9cd6d6e74dcedbcfe2cf880ab88ec2e8072614d0ad2
font_02_sfnt_off000134fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FC 10820 bytes
SHA-256: d388cd0b3736d58f29085b11175ecf0362faa0693f28f541f090d91a2c45bf01

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