Malicious PDF — malware analysis report

Static analysis result for SHA-256 64df7023ab9c0c52…

MALICIOUS

PDF

69.5 KB Created: 2021-09-04 19:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0e2b8b0e246ef4bcdc4f9448fbfb0e9 SHA-1: 77b51276f1651a072d2d7e8d06b7f67d195e412a SHA-256: 64df7023ab9c0c527081a8b066084940f1cbd7e0d2c47388d885bfc3cc1dc997
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress installations and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=principios+generales+del+derecho+laboral+pdf PDF link annotation
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1783a0d79---bijasu.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/jeluget.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ca307cd0eb0b96a6f2f3f33321cc1242/ranakosogopamagulise.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e32dbbf8---28255966929.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/d8867106754b5a1b8364058bf0ec1226/99446215488.pdfIn PDF document text
    • http://atek-ent.com/upload/file/34674749780.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/faa258d4ae19cb08d37cb2bb3d91cf18/panenonifugimazojaguris.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/79441299359.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/16383896147.pdfIn PDF document text
    • https://led7.ru/file/junepafimitotep.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0ec713ffb4c500484fc71ee55c566702/jemasuposovakon.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/daxezeraduj.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/161100567948a6---79330497735.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/fazebazuzikuxuf.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/67172451085.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/60027124967.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dcee06fa143056eba3ee9d64149a0802/napifezeteraral.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610df209eb022---bilemanipazusuzopigufi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0655303b7---34192668440.pdfPDF link annotation
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f506c8929e---pezikipubakonowedi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/41hmcp7enu7skl9tqh79d45j36/lozesazuvujafujavagevelo.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/tikifidedipaterirasot.pdfIn PDF document text
    • http://186086.com/upload/files/mizivoluwokezexigab.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/lofojukagafil.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607303070b33f---48907589642.pdfIn PDF document text
    • https://themalc.org/files/file/gojanojib.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_off0000b460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB460 14200 bytes
SHA-256: 9d03f5fef9b7ac3a8c269ed398c13f57515f8b8d27a09a509646c0c543b48254
font_01_sfnt_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 10944 bytes
SHA-256: 7a537a22cb62c4cb98baec9364bbe1f0ae4adc3d36d57f09d858a6cbe446aa93
font_02_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1