Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a71147327a56f79…

MALICIOUS

PDF

89.0 KB Created: 2021-09-19 07:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 40751298a4fd28aa135487216973645a SHA-1: 4daa2346b0bcfca536352ad9f098565501c8dd8e SHA-256: 9a71147327a56f79aca1b7752bad8e6098aa8d298ebdeefdcf2601a5c40a1957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to lure users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=the+handmaiden+full+movie+123movies PDF link annotation
    • http://autovoda.ru/upload/files/85836423136.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/zevozivokuguwinidomi.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/varekomizamevanorez.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/memisosuko.pdfIn PDF document text
    • http://riph.pl/userfiles/file/1905751955.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/dawodorukufadapugij.pdfIn PDF document text
    • http://roocenter.ru/upload/file/99571329963.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/836947282.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/89231142727.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/gaxaralijiriripakupida.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/temabulegumalone.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2a6907aa9---rolavavofimosusolanexufax.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/21034455111.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/83457068497.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/tiwigaditukesizefadinoj.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/97014627003.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/76892879316.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/99355129777.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614505f78ec21---fatalibamokafugu.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/72184982565.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/wuseletudepozogunagul.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144dbdaee3cc---kinedazazirovoteduxuxade.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614174e0b029c---27446375613.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b459b3fd2b5e5f4352e8b63002b496a7/tapatudoxefonopexiwu.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_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 10892 bytes
SHA-256: bf4528115aaf68e407e900795f10fb6f28c128ebc11fbdddce50a5fcf9e164d5
font_01_sfnt_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 19272 bytes
SHA-256: 6fccaf8cf6b90cda9a92b3b091d36b867fbb8c209078ffd1ad9e8a01f3a0238e
font_02_sfnt_off00013e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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