Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92d5049c2c42dde…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 03:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 866639fdb44dff87aec159d24bb4a518 SHA-1: 165b02c81afc42e56d9aa5b35b62eb85039ec8ea SHA-256: c92d5049c2c42dde99f4f89f07a267990edbd5c88e8a62717d8671cabeff925c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of many external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=present+tense+worksheets+4th+grade PDF link annotation
    • http://czdashan.cn/uploadfile/file/2021043001010973499.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/614d03a97023a18c2cc8309b10117043/96440434743.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/84fff8cba47fd964b0adedf0f19c7023/65393036863.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/47802930585.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/1dcr1bn8rjhastb0o4gcvidag6/8477769272.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/7958701902.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/namebo.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/107a03dbe5fe809863b0b17665a38d70/67225965986.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3b7f1b8a---zemovujimaneg.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b967c1a6---52674204222.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/ponawogirexanid.pdfIn PDF document text
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/goxomemijemetivadakijuba.pdfIn PDF document text
    • http://freetds.net/userfiles/file/fusadan.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/fbfa9eb8a19bcb1bd942eea149bcbdaf/28319149642.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/71002624887.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/69288627551.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d590dc417---69891021670.pdfIn PDF document text
    • http://amdind.com/userfiles/file/76294081359.pdfIn PDF document text
    • http://jngf.cn/files/file/pofupatigaramakunulafuput.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0a278284fa7f4384fd7f69823ca3217b/gizerixewesetumumifuzibo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb4f00f8c---xaxawipaxufolitamovironab.pdfIn PDF document text
    • http://proxima-design.cz/files/file/zobojifajeden.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/23756734811.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4f75daca1efd0865b5812c7979df821a/22157034181.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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 10648 bytes
SHA-256: 4766720eb923b56f86a4b284972fe03e52ea07964e028fd8ead565d1e0533f06
font_01_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 19232 bytes
SHA-256: eb151ed0575f615fe3ffb36ba3caddc1ca7840f3722ac29dea261a647da893b1

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