Malicious PDF — malware analysis report

Static analysis result for SHA-256 9438aa86db7d83b4…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 11:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7ae275f5d0b68cfe143b4d21c1158cb SHA-1: e8944ccdc879e7d8321017362c7b3704e659d82d SHA-256: 9438aa86db7d83b4a3fe89fbbe6ba5186a381ae9e95c3bbdfdcb6ac6fc5da6ed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous disposable domains and compromised CMS uploads, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=zapya+download+apk+old+version PDF link annotation
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/96030783469.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/vupakigonolake.pdfIn PDF document text
    • http://ijfbn.com/editor_up/migatidutevozegezasijowe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/u7rq6s5ocv9skmt9jmb89hh7b7/40753791023.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/xejawogarivifipigesebup.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/47302468586.pdfIn PDF document text
    • http://ha-sine.com/d/files/44514010936.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/zukotemofiwofufikilimusu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fec96588be44d132f40134986cc02a3a/moxafobik.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/kevebidesuvesusumorivovid.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jikaxanowafezemo.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/7380656224.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/50960623129.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/vilusixeremimon.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/43940758890.pdfIn PDF document text
    • https://ghnservizi.com/file/54685175484.pdfIn PDF document text
    • https://tonitomov.com/picture/file/wovinatinuselekino.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/xuwezazaliwubaruzulavev.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/razebiw.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/8441425384.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/donutufazojorufajabim.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219461415497.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/42663213726.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6d050bc6---wurokemaxodet.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_off0000d430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD430 18852 bytes
SHA-256: dc5c7945873c91a5839ce3d32a3bf913075847ae31c87f4d938095a00a6c68ac
font_01_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 10608 bytes
SHA-256: 903231818b509d21670eae48d33bbf8274d5eaece3afa6415bca4b315617aade

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