Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0fff11a3195959…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 20:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c12ea4ff68469eccec70c59b7f59e43a SHA-1: aa5f218f2277a472fc630a90901cae9d65f3270d SHA-256: ea0fff11a319595946c6ea622841c66a222e0b8fbbb7b57ebefc40e8bebb9bcd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristics indicate a link farm designed to obscure the ultimate destination, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://greenld.com/userfiles/simawutamujomafuso.pdf In PDF document text
    • https://clubslotalmatriche.com/calcas/file/59106820722.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/wolilo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607faeb0c7a5d---29785638473.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/mositefuwube.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085a4ef1c4e5---fefulefowevewaketogamumus.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/derulusuzaxuwuri.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/16200252175.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/21113063195.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8913990dcb---23623483592.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/20991256075.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/vumetexoked.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/73559844309.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/75534106283.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/33823459011.pdfIn PDF document text
    • http://torgoborud.org/images/file/18706125457.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096112d69dbc---silamaze.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f38245a8---zejupabigoxexavulija.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/xolivusupukedegigabura.pdfIn PDF document text
    • https://premiersuli.hu/files/files/31234547710.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/85177486617.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/vizotukifufaletawuwatepaj.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16112e55ef2dc4---raruraxuzezosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=lebanese+cuisine+recipes+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_off0000c873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC873 18420 bytes
SHA-256: 1936b920e48b8fbeb71ecc64bec55a639e884c7f065fe8f94c510a4e860db226
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 10544 bytes
SHA-256: 3215fe2a4942d02cfa42f4bc68f5a4ad0ad5ada5bf75f48a05710b5b1254465c

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