Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef82815b2fbcfb84…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 05:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9961a976d772d1be3c7f4116ef4911b9 SHA-1: 8b0a625d9c2cde263d8a9dd2b02856177f3e4414 SHA-256: ef82815b2fbcfb84ce90f845d14cde55106c99284bfac7016948088a7403470f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm or phishing lure. The PDF structure itself is also noted as potentially compromised, with duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=mapa+presion+arterial+pdf PDF link annotation
    • https://aarhuskortet.dk/images/file/39387371162.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/57421640943.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/58704660537.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/76315326769.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/43154793747.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104281831214947.pdfIn PDF document text
    • https://businesslife.com/content/file/36930914961.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/vizun.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/66c1cd42a17b0ccc5e5174fd62420c1b/tapigi.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/30453998755.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607807e2827d6---7649005518.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/olehbdih3tji3hc9a0ttnt5e07/novojilaba.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854b7e36f80---figelutoxa.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/35077712538.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/11838470107.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a54f4a52070b658720f1b50988334ffa/fubitof.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/73964719207.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/vekogijupigurakivaruf.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/11471407354.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/88371954925.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0915bf315---nediwafezozijav.pdfIn PDF document text
    • http://hevolta.com/upload/file/supepomavazukametiwitixe.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/k4naol42k805ml35ftibk9fpq4/54286574142.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_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 17584 bytes
SHA-256: 569db7670431c9bef3b19372021d524060a49d757d01e182ead8bf1fc56e1807
font_01_sfnt_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 10484 bytes
SHA-256: 46c8317274110e9112870578ce7c8cb7e652f695119a3cc2083042ba24227695
font_02_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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