Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc1636f9c9b26f4…

MALICIOUS

PDF

94.5 KB Created: 2021-09-03 07:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d045154db26336b98571c30e47c31739 SHA-1: 7262a1a79a15e3c4f2c33af7d444111eee0cf5f9 SHA-256: 9dc1636f9c9b26f4b5eb50d7064da97421e761886f3f59f2252b494abebc3c6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards a phishing or credential harvesting attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/daa12htpmskl6h6if56d9k12oh/kerewebubig.pdf In PDF document text
    • http://sddshchb.com/userfiles/file/Fl202108121702268575.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f95d93e45b---98762712380.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a2f1f007bf444f96fcb842398077c2f/84819433721.pdfIn PDF document text
    • https://palet-school.com/files/files/mujewemigafijo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fcda48986---62000842285.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4a914ad006835c2785f3a4069385a13a/41108444618.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d2405d56fe6f1f773a0c7ee3adf84195/31718429022.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/bebasedelitejoso.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/62948169596.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/77585072459.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/misokatubikuloruf.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/7523678127.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/17553315671.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/lf612ag339toi0sqtpu0bb3ehv/bejogen.pdfIn PDF document text
    • http://skncn.com/u/files/77083675204.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/l3d1j8p7536cna6h83uno2q0b6/33555125104.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/23943792884.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/g8qb32a7iukti5snnqfe29oha1/nugipatibefexexugibiledel.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba86883158---58433638705.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ienb8jfob1bnprlkkjtncpkt65/30741888452.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160df021b8d413---sakokikelepev.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051606312184568.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160747f7bb4e7d---dedelanal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=return+to+castle+wolfenstein+strategy+guide+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_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 18104 bytes
SHA-256: 5f784698108c5d10ace092fccf22a85e3a1288867152051d2267a83b92b3da5e
font_01_sfnt_off00013a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A05 11140 bytes
SHA-256: afd5e78d538065e85f7cf481e2e7135e624de9d8892e8b129b01a74d16925eac
font_02_sfnt_off0001540e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1540E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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