Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f71c4f19941cb9…

MALICIOUS

PDF

92.0 KB Created: 2021-07-20 01:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad87e32987315660b970c2a43499de83 SHA-1: 3b4a1f649ecfd7da00f55d69760740bf6e271847 SHA-256: 78f71c4f19941cb941915b7c2b7dfceb7702e1cf5441d598e4ba608cd6807aa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature imply an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e70c7dfa762a5ac927561ae7e6c6a440/dedap.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b9b9aeb65---wuxodutobo.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/dozip.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/87284891955.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/mumukisopolagepafesedo.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8134c353439f2fbaefac2ad63b8c937f/48369845046.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3a479f1220535f9309265d67fcdc5510/vafizazipoxuziz.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8aa507df1---48831324640.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/pikuvar.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a7bc0151d232afd384c8118545f0ce6c/68748202616.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ed824e9d52018c61a9b7f2f4356fbc46/didanajobegumatufavupavu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jovikeridilifubu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f2a320af---45690550922.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/ferigapetaxegogejivotej.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6c63ce86---dotalusukefajagifoderuz.pdfIn PDF document text
    • http://kclandscapes.com/ckfinder/triplebuserfiles/file/fijidawifolawipeloxobewik.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abf72454941---6985852297.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/99950638030.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16073989f3bbdc---74544172452.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/8072168966.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/womozepisipilaz.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/60mkolf20dkpg93rapau0p7b40/5885152832.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57db412ae---tojedaledubumoges.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/mojep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cbse+class+12+chemistry+chapter+1+intext+solutionsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a980e7a9adf---begoxusukuximoburefukajov.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_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 11300 bytes
SHA-256: 6ec4106bee1224bbf59961cc0696b9b0bc918e4d1ea89e1a0b48f48c3c3e239c
font_01_sfnt_off00011dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 17220 bytes
SHA-256: 1bc4e18aa3be6724755cb0a4c0d63e6953edacc1df373e86bd80350ced250b98
font_02_sfnt_off00014a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1