Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a374d1d9324701…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 15:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc3a27d01e23956867b240652ea34a0a SHA-1: f79be4ed0c256b8dbc1514e0525f00f157f2093e SHA-256: 98a374d1d93247011274f86e7a77c1f0b5164f64624de87d24cfbe3ef6cee250
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://henseltech.cz/userfiles/file/90169193989.pdf In PDF document text
    • http://kaitosushisb.com/uploads/files/94575260367.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/besebiza.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/61564931863.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16070fe00edb04---felivelibesavotasa.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0cc1d8f87c74db22c649c3e5d5641465/tutitisanodokuparinasonib.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/tufamojete.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/zulagipaboxobixagat.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/da1d53be7e1903c8513f80cdb0d88fd5/toxivizexuzerimazojapuwa.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/14029433561.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/5120244120.pdfIn PDF document text
    • http://farashimirooz.com/files/tovonaralukosometon.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a716c64e929---rumovozufaxuxunusow.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d53e4c52a1---66907412294.pdfIn PDF document text
    • http://landpas.pl/upload/file/45989576266.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/zaporinonodina.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/e8n0f9o0gb4f0eehednt7i3993/66309207759.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/87465142837.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/222229206f8394e0e1a2694e8673db00/votalagegosupi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16114a462ccef6---31094910286.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/jgfvvmjoe0s2tbqa1q2v7rskj7/71005274455.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50f5752ef---litinobesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=applied+mathematics+for+business+economics+and+social+sciences+by+frank+s+budnickPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/butetudizuvavap.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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 17416 bytes
SHA-256: c1642f94df5757ce0c4ff66ebbf6bd8455a1b00273243e96e060efceea22261f
font_01_sfnt_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 11312 bytes
SHA-256: 537e1c6d190fd32f7fe037940fea6efca29b2ac41c1c018249dce25545bcee34
font_02_sfnt_off0001214a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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