Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c8ba3ec190a927…

MALICIOUS

PDF

94.6 KB Created: 2021-09-07 16:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3ac88b9aef362153f70fe6965bc8949 SHA-1: b8b11879aa3bcfae714fb9cba20df7956949dad9 SHA-256: 59c8ba3ec190a9278b27d1d5f0423f2d753269196b3ec562eb3b08f62906fdf8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content, while the link farm strategy aims to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=les+courants+litt%C3%A9raires+africains+pdf PDF link annotation
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/gagebaxumos.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/17107554691.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/79512471396.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c68ddc18fba---mokaka.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/1286628262.pdfIn PDF document text
    • http://nktrading.qa/file/files/tanujokarunuvef.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/43906234550.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c30d2223---siwudijubuwet.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23165ea7a8---vuxepuxixutedawafozufubim.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/pqos05io048m9he8fcdeh0ajr1/gaxarawejipu.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021073007002267.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce64890b8e---guvujanokedovovazola.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/d671fc442b543a55542dce5ce04b9c26/makipaboje.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7709bd1b2d6c3e3babed8be9bd12a1ff/34524135361.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb9e382d4---97666643474.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f507007a6---59019956372.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/nowobonoz.pdfIn PDF document text
    • http://rsst77.ru/upload/files/mifeverakitopepapujixajoz.pdfIn PDF document text
    • http://abnicum.com/files/file/lavazipuputixafadizabaro.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdb1545b56---35145060738.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c03f62bda83c5c76caa033d5bb283957/kotifukuliniwoxabigo.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f5fbce82716d8914f950961cfe08493a/13353684407.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3859b8b36---18816262705.pdfIn PDF document text
    • 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_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 10824 bytes
SHA-256: e7dfb9c004cf7dbcf73ee9a2397067c643d66258d50526e9fc3b91bf44ee0ea2
font_01_sfnt_off00011751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 23836 bytes
SHA-256: 0093e63246c4e8f4d1cf480911cd3bf6cd41d4ab013ce62a6e1b4cd0198b4513
font_02_sfnt_off000152d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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