Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7532655221747b…

MALICIOUS

PDF

88.4 KB Created: 2021-09-20 01:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ca3f01fd7aa996d95693165ae1d018f SHA-1: 42f23a7bc251e347b388ba1bdf18c87fdbffc988 SHA-256: 9a7532655221747b97030ad716af2ee9b134da18e9a83adf0fc1a3924dd9f08b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, pointing to multiple distinct hosts, some of which appear to be compromised WordPress installations. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://maezawa-jidousha.com/js/upload/files/nukolasarizonum.pdf In PDF document text
    • http://emblem4home.com/UserFiles/Member/File/57238082825.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/febivabikerelaxigi.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/manaxowewelixuk.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e7282e2f2---woxavewevi.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/guwiwovotozete.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210902192540.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/rikolujimaxowinexeger.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/vinopinure.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/xepifoxazokajamejasif.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/dodija.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210904014550.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210913125010.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/19231055972.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/bevikobuburaraxunew.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/uf6crn1vvsa63chm6erh489t64/44981751071.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347b16448da---87636131774.pdfIn PDF document text
    • http://ymmicro.com/files/files/39237852593.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/23053870979.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614706b44c4db---1043779634.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/11047228658.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/58953639147.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/23827668835.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/50282169353.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c177a67cf---zevazijiv.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/54393060776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+allow+apps+from+unknown+sources+on+androidPDF 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_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 18260 bytes
SHA-256: 37c4fbe54e5264b7a36d550a03f26aeeee8faf751eeb6b73b51340f407c20661
font_01_sfnt_off0001216a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 11052 bytes
SHA-256: 28aa288a28b93c00dbbf4c9b8e99cd0b63c920b553d5b397ccf4af5edbd65a3f
font_02_sfnt_off00013b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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