Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39b438d0d065f6b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 17:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a544dae7288599df739efd6af03d7d5b SHA-1: ece509a757db4169ab11946c6334fa645b3eeb35 SHA-256: e39b438d0d065f6b5a47f4696ce0f96270224367c988de84b992677bbbd13d85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/ed2936fd49a3245af7d13ab3f28795d8/pulunofonoketawosigawigiz.pdf In PDF document text
    • https://asiajitu.com/contents//files/sutenab.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/dujetiwijabetaviludu.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/7f6af9819b140c01ae76af9576733ee5.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/46027373128.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/1847994094.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/fevageluxupumi.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3233f484f6cc03fc5a2cd43c77059e10/19578807184.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/71799e04c74918dede2ca4656d2765ae/49910024894.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/gunudaxutabebew.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/zaxogizawibadurejavexo.pdfIn PDF document text
    • http://meyras-tourisme.com/ressource/site-image/files/xadimifejipojedo.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/69085368195.pdfIn PDF document text
    • http://redactron.com/userfiles/file/mexapixikokaxosefejukejo.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/edea583719125c0062591c8bd2c1f3f5/44633241926.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dadcf6d46a8---37368021236.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/mutazegebekotegusu.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/13351474087.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210708_D6A1A0195ABA8CA9.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/499a0f3dd2aca54caf4225595e0b22f6/lezujuzigofugifukud.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210628194239.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/82297225563.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/63327996120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+fisherman+and+his+wife+grimm+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_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 17632 bytes
SHA-256: 4ea76bcff1f538311cd2310a7b9614d05f8f3af08585615e28b76681742f56f9
font_01_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 10732 bytes
SHA-256: f04af909b8a3435f362ee13fd3298ce3ae39cc82b611e8dfc9734c4897d57539
font_02_sfnt_off0001279e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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