Malicious PDF — malware analysis report

Static analysis result for SHA-256 f938fbb05f7efc9d…

MALICIOUS

PDF

77.4 KB Created: 2021-05-28 06:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9041522ebfd1a3b94d8e7658a29fe097 SHA-1: cdcb7faa3432c7deeca7882880a26675661d0ee0 SHA-256: f938fbb05f7efc9db0c3f7de141312a3010a0fccfbad9587722c64233612879a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://catamma.ru/uplcv?utm_term=ejercicios+ortografia+h+6+primaria+pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088016626a78---xuginobobenivuxuzozuxuxij.pdf
    • http://blueyee.com/upload/file/222334382385.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/h9rv9alna14965k9dgb9gjr21b/sitawukopedugi.pdf
    • http://korean-school.hu/hangul/userfiles/file/69258752968.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/j23472ph8ht1km089gijpqk5hb/50495622522.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31df464ae---gitotomegurarami.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc65136db---2113126499.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090b36c3570f---30259160282.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afcf362dc4---73735000650.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb23d3d07---dizadod.pdf
    • http://aisef.org/uploads/userfiles/file/file/semaked.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c59d4b38---balifap.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0d2c2e160---xorezufuz.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/e2sjnk80f6s6iofdvoc866str0/29819768104.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed94.bin
8ec8965593ca20dabb1e53c76a89999d33d736e002b0e921b2f5ec1e1494b6c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 5724 bytes
font_01_sfnt_off000100f0.bin
1357595bea3958ce3fa9e77daf5de5a59dc98a794475940736031cfed9447d93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 11900 bytes

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