Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9fdf5ec499d61e…

MALICIOUS

PDF

91.1 KB Created: 2021-07-01 22:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c942be9f8b42c1cd7c83cd166be238e3 SHA-1: 287d982a8856dfd6779030c2aeb2e29c7cb0cb29 SHA-256: 2a9fdf5ec499d61e8dce7a1b22dc11cac2cfb56c0f986bbbf51034495730eeb6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of ClamAV detection and ML flagging indicates malicious intent, likely to deliver a secondary payload or facilitate phishing. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://157.230.241.115/image/upload/File/28733493137.pdf PDF link annotation
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160755e1332337---badibix.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/winosajirogitadifivo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2eccc555---24820412267.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/2bb76f05843cfffdd99bd97e2e206965/sotidikawip.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9776969586df629c4fc7eb580db250d5/71833837619.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/vevedibazidowoni.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/41554318031.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/28ab3a79e8cf7ef48edbb0c005a36ca0/54898181429.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a4425da06cc98378cb5852c6ca4b186a/69725390397.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5a5b50009---surepebezonorebitolipon.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c54867156b95aec424c33ea67ad05395/39629751358.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/5088695540.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/743261eeddfcec14c6b0067680f534bf/81314064113.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b8dbf7b6d2afd5376f7433492d31ff95/25647294683.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/98100573107.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608999baeeb0e---jelogebekumabe.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1851611b08---46201367768.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d02d389a---45825130129.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/wepewawenig.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e02277725---48290808891.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/aa057a1e9f3fcb06d081dfcbad6836d7/13657361186.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/14281003102.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b90ff8a24af---6401377007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sweet+words+for+herPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 10208 bytes
SHA-256: ecbdd422ff779d4f9b0cb4d0fbb1735864d73e45aec05f88570233e3e3dcb572
font_01_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12620 17480 bytes
SHA-256: 7ee91c0674140b9bd42b2a5a6620b3f0d8a148bf552421f897c0bc691cab36b8
font_03_sfnt_off00015407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15407 2120 bytes
SHA-256: d379e7e33a0c3d504827bd609d060491fcf925ac03517036953345ed3fb6af85

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