Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73939584bf31c31…

MALICIOUS

PDF

89.8 KB Created: 2021-09-05 04:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8080ffc9ad027f88ba702a976a282e7 SHA-1: 99620ed800eb6f41eec42357686c8d2b91895f13 SHA-256: f73939584bf31c31bcd4b91d590ddf343260a87315b535387b22d363fc59892c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to drive traffic to these sites. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1v71u0murva09pir1v7gfbm6cr/turezisufaxomirufoxenejuv.pdf In PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/11974933891.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/3430625124.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/77336770185.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/fewonifagiferafogux.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/kiriku.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/92627768120.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/96713301854.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/59813869897.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///zakevulevikot.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/fodafafumejikipipulumefa.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1dfd76445c09b899a32d6a60510113bb/zexukoxab.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/40615342288.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/5218bf663365f3902429cc5b95f0811c/juvomibo.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/pigoboxexarakododo.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/58519716054.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c08a5ae65---xoxutarafisafisipebudil.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/784204117.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f5cce348---parapanejaranerisakazeda.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/72994879893.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ccl0u99t5tk7fttp04o2aenvg3/parotevod.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/91777891079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=present+continuous+%C4%87wiczenia+podstaw%C3%B3wka+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_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 18684 bytes
SHA-256: 9dc531348c519ac688e02955ae13a92d2567f451da2996c09c608ad2eb5c8bbb
font_02_sfnt_off00013d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D70 11180 bytes
SHA-256: f3c7c561458069fa8b1f86a24809becf759cd095b3845e9f0328380db133b752

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