Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b76c8573dab767…

MALICIOUS

PDF

97.1 KB Created: 2021-09-06 02:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82f63d88d9cf6f580d8d4c08d1026d87 SHA-1: 954cc5b04010d95b82dc09a96040d0711906b4c0 SHA-256: 58b76c8573dab767286dda2bf265226907528ece1b5d6d8961ab9057334ddcbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, a common tactic for hosting malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns suggest a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/o7t4o5ohnqj6lkkmijsn3rgh1n/wosobamapeladajekuwadaxe.pdf In PDF document text
    • http://limeitec.com/upfiles/editor/files/10242289084.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/renuvureluxumoso.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/89374666863.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9cda4b0d2b---valol.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/kemugimoxaw.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/43538250291.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/63fba92a9740d154612fc4446a99cdee/27371752796.pdfIn PDF document text
    • http://93564497.com/userfiles/lepupe.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/4gu37c4v9dfv1tkt19vkguie8d/gitevezudijunofu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c715f5374fbabc62faa9b3e3912a45cf/66316519730.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/78046619021.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/86449095031.pdfIn PDF document text
    • https://livonija.admark.lv/sites/livonija/uploads/documents/files/64854874476.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071888e6939a---80391315725.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/zobatapegelax.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/29184806652.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/betopozivijebe.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7f4b7e13---fetowavebolegudosori.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/03t81glji1a6qumvlafi7arcp2/57280787276.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/kuzusa.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8fkj9tlen2ct0k1cb40ub17l27/tigejuzurenikonomi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161074c3f9074f---32400395783.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/koxawesamuvasezekuruvogaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=demons+and+demonology+pdfPDF 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_off0001120f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A21 20280 bytes
SHA-256: f50ab7274fd3c9bf4c0520c4f9093896ebf1fd7546ed3a2fe6d470efe145025a
font_02_sfnt_off00015f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F11 10664 bytes
SHA-256: 5a811e4afc5a6c2a9aceb0cf8ff691fb29dd5a37c874ad4679073406ba25f305