Malicious PDF — malware analysis report

Static analysis result for SHA-256 5254c1be78b5290a…

MALICIOUS

PDF

136.5 KB Created: 2021-09-04 02:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd61f536fda694d8bcb3fe9e06614edd SHA-1: 6bdc65332fb21cf6fb6c799a9410d0ed8dfd14b2 SHA-256: 5254c1be78b5290a3ecc1c3d3c018f02bf554268c4174ae17f2c8a54cda0c7ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pistant.ru/uplcv?utm_term=bionaire+heater+bch9212+manual PDF link annotation
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b76becb8b8e---xawom.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40757fcab---puxevaxofanume.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/59d58f200b6501d5f58a9cd0da5f9459/mobedef.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/50620031165.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/lafezanuxaludi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccc053bdf---15039683444.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610df1b243ad5---60199715382.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/pugekedugebor.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/losaroxeruva.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/danibewerazijek.pdfIn PDF document text
    • http://elpijisystem.com/file/98233274282.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/51738730567.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/2827161398.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/marukidazawanajiguxexef.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/valug.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7f7b0de1138652cfe6a34c127fcaf611/33441007831.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mituj9ogfagap4snntcr4mjkg2/54345137569.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/0e2f04d65698f880d02f7d4d13b558f4/limepiduzozufij.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/jugimorilonowokoroveten.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/dubupikopujeromis.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff500de0fb---nafinunifupakesonen.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e4bea546641f2e87691c3d1f8212bdc4/selogil.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/97785935354.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9374fb5bb1---faxufoja.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_off0001acb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4CB 10960 bytes
SHA-256: 6689b41404343abc80d7d0492056534dbc86334159079342628238bc71e541e7
font_02_sfnt_off0001de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE1A 21020 bytes
SHA-256: 3ebf87d257972b31775d11451bf3bfcea9b7b0a6d9d3429ecf8d24cdcbf0ee56

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