Malicious PDF — malware analysis report

Static analysis result for SHA-256 c742ab16c165c4bd…

MALICIOUS

PDF

85.8 KB Created: 2021-07-07 16:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4e0ecef11fd9fa05267367439a7fa915 SHA-1: 941266fa4c51c851ab7b0e263d9ba58b4dd7cb5f SHA-256: c742ab16c165c4bd19726848a566d8dc0f759461dcd8a134d91e872250285dae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=glial+cells+found+in+the+central+nervous+system PDF link annotation
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8bec98e9722dadd6ba0c5217fb510118/sopupavimumojotovilet.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/11991322967.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091025d4bd96---29162385048.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/14857136476.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7d3c087c60115ba83ba44ebdadd16e69/tekepifonorubog.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/99801764135.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a6673ea7b---bowatixed.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/gobodewasaresipu.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/pamevegipiwonez.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/1fe6ea8cf9955422191eb87562f15a9c/lunujerinas.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a605cee56d---gipumonubomabadali.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/27590375503.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/42189807222.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/i5f7rlm47f7vc7ar5enqile2v3/todopewatovibimokekiku.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/jizimijolivuv.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/sukitupatifurevelabin.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac823d8a6d5---kopedi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/h8nqagc1b5oj7lgft2sugf4m0v/mologiluvuk.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/3247508323.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bbbc9ae3bd40a07447ec1e96b3625898/pubitolafopojenojexu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48b2dac0d---56651485693.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd799e62a50---10615913963.pdfIn PDF document text
    • http://aceranalitik.com/ckfinder/userfiles/files/talabirojuzisefas.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_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 16592 bytes
SHA-256: add6d9600600e09324d05712783dd4163345b94471f3e84d0605d954f35d06cc
font_01_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 11060 bytes
SHA-256: 72e38f8b7113aa570b8270d5d566bb0ab955fe5b35964b6dd727d0cebf0d753a
font_02_sfnt_off00013182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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