Malicious PDF — malware analysis report

Static analysis result for SHA-256 656a2206d6fee111…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 10:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 65d5ea7591a465b385de82d8b8d1463a SHA-1: 9c77d6c8c7eea61f591f938194992b5bf13dca65 SHA-256: 656a2206d6fee111db7cb623cdc2b16494b91ef31316bea721a378ca5164c3f4
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users. The presence of multiple external URIs and link farm heuristics suggests an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://gloucesterclassof81.com/clients/23558/File/81107108271.pdf In PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/4hrr3n4acuhscl0fembvbf4vd0/55371346686.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/59834754236.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160921aca764ac---6709962815.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/zexuzafos.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/xejodulunijax.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d750a2f88b59701ae61ecb9c2f61b16f/86354793362.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/14426211074.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/52804782177.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76109728653.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/xolamubivazejal.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/jafowewisanonepulozenibak.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/37630447628.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/21072915270633646715ov116ay3ft.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3db1a36212---98996585710.pdfIn PDF document text
    • http://apicn.net/upload/files/63983159250.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac6453d37---45242996212.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/30555941458.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905135623629552.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/zoxomuwozanakarupasesivu.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/rukapugibu.pdfIn PDF document text
    • http://learningkey.org/userfiles/94613426997.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16117e84aa190a---lisexabadikolobinepigaz.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160d284fe93379---72103446807.pdfIn PDF document text
    • http://ubest.ru/images/file/mosevoboniwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mobile+application+development+black+book+pdfPDF link annotation
    • 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_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 17608 bytes
SHA-256: 285ad06842819d2039c768ca5438304043a407475b8fe16a9c3de9a65b4d335a
font_01_sfnt_off0001196f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13186 10804 bytes
SHA-256: 126ff61e022308951c0d524f972d75787666785769192f5436059346b96dade0

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