Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9907a195a1d4ad…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 10:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d20b6bf9faf890c042486d656584208 SHA-1: 43279757a7c0733f8630de8c9fdbf13bc20dbef3 SHA-256: 4b9907a195a1d4ad18c8922df2e8e47feca05f8c9c79d7714af56fe7bc6a066b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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=stadtplan+basel+innenstadt+pdf PDF link annotation
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/38d96384f5ac44395ac54fc716ab046e/60505152254.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a30ccd81---paxokemolunebenowezelozag.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610079a23ed46---88809673191.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072951a8e9cc---8578457336.pdfIn PDF document text
    • https://ancoraeducacion.com/images/xepijegemegexetosaxu.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/84472059877.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/wifuzunegejawuwuwales.pdfIn PDF document text
    • https://cakkue.com/contents/files/65491099806.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/jupijuxosonu.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/29047912252.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vnjc3nmhqd8d3jfqh9ja9ufrh1/dutupolopisuzokitozeme.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/ziviwe.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/93327395029.pdfIn PDF document text
    • https://mollis.rs//files/lewazedopew.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/705e4ca90adae22ce79e4e95ccd73206/67650671233.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/70salogae4fjhfkckrhcflusb4/tewobilukagovovopato.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/4d684a5298d8038b5efa894f0b95bb77/25177318257.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/jepadezet.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f65431c4eff---bajodixinafilet.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f446865ab---zuvoxunomepimitodu.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/31112290138.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f0f2566e---vodoj.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/93739024264.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608a57ec897fb---petewewewufi.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_off0000ccd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD4 17356 bytes
SHA-256: f67d74ca3ade8a692681081a9640a9b74398a7593e089ee594da168ed4ab1aaa
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 10488 bytes
SHA-256: bc58ebf946e39a4df195b82def9decc9798a70a788add61f823710d53427d7be
font_02_sfnt_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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