Malicious PDF — malware analysis report

Static analysis result for SHA-256 7677d7823ef12516…

MALICIOUS

PDF

84.6 KB Created: 2021-08-23 10:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ee3ad817d670f3f68dbc977885ae74c8 SHA-1: cc1bbab459eb748f1a9f489b1d5506985a51c07f SHA-256: 7677d7823ef12516a94a5a86e999be4ec406796c3a71783415568d77b8a0a3a3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document instructs users on how to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=how+to+open+protected+pdf+file PDF link annotation
    • http://beepost.vn/upload/userfiles/files/83488045830.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fbbfd0fd4---75157735304.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/mozisugekaluw.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b22c43c6f3f---41245895332.pdfIn PDF document text
    • http://asustainable.com/global/file/dugevexepegu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c852f25eed5---puzosunifezinarobexotejij.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/2c9a91b7a1f61648e914f56439d72240/lewobukuvibaguta.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/42843852943.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/jurenuke.pdfIn PDF document text
    • https://ptogel2.com/contents//files/71030119213.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/vidopalasesax.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d79b4b849---15103526683.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/78f4ce956e048689d4b5c5e71f1c89e5/12810059893.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/tugejonaralivotat.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/19295205948.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/37284350616.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l9u0jc67jnaak52k8pnj6fncn2/83827838204.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/445069f12521b5c8c6f11728fd06ed0f/6561606231.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5d1e4fb24---42286383019.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/96862504733.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9268375a31---kaxolufikurivadeji.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e617cd3eef88d40c78accb298a607fb5/93682065352.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0fa97d95---11321082870.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/zimopebukizog.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_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 16556 bytes
SHA-256: 96045311ec5d1c1623c458d4cc1abdb78e5a836db2d2b48369d967a3909fdf1d
font_01_sfnt_off000114d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D5 10360 bytes
SHA-256: 3ce25abd379d0137a93d297fe76aeeb588e7c1e5511e7ebd3601a3a1ca825fdf
font_02_sfnt_off00012c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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