Malicious PDF — malware analysis report

Static analysis result for SHA-256 768f0c7cbe92a7c6…

MALICIOUS

PDF

90.9 KB Created: 2021-06-27 21:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89658487cc9b48288bfea3457fb82ecd SHA-1: 486dd78e67f4c341b0b8a6b6fba82cee505387eb SHA-256: 768f0c7cbe92a7c69b98012c0862197f80b8b71492cd9445fd92a7d629e4a82b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this, as they likely host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/6bt66pk65ed3gkm2qcpfns4dgs/72273922372.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/94713413008.pdf
    • http://bighost.vn/uploads/userfiles/file/91490104991.pdf
    • http://findmecakes.com/userfiles/files/62545867236.pdf
    • http://mnwebdesign.dk/userfiles/file/93669069511.pdf
    • http://erdivigado.hu/userkepek/file/budixumoxapifokagufijoxe.pdf
    • http://dnepropress.net/files/file/dinixaxukuditugi.pdf
    • http://www.celso.org/download/18663321033.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abe8c4ea128---58074798763.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e89c272a1d---94774219838.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0e51e1ac---47820081350.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9ae54f379644a947f7a4759d7ff2c634/23768552551.pdf
    • http://thsport.dk/ckfinder/userfiles/files/raxuvukoteriwipuru.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e0f14178---28454562966.pdf
    • http://zhengfutz.com/v15/Upload/file/2021514193251291.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/79c3008fefcabf15889b16918ae8bf32/55920444358.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/be156d70744e967d2af847f390b90c79/juvalilevurixepusasuk.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ac5e3f1e6975d857030e945e2f1740fb/zagulowipusirura.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/p3k0f3828q4a530okmpsrnbs94/zoxuz.pdf
    • http://drivingschool-brno.eu/files/xaxekivoxoposoxugafej.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fb2127684484f686b77f37343db84374/nuxusolunefajebifareku.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be82d9d91b---32665708407.pdf
    • http://mousike.it/img_ins/files/11783336402.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=figure+drawing+practice+images
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f6.bin
cc381365c1a820ec204917ce1a8a5c49c57d7e2231b657ce26260b2a0566998c
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 16804 bytes
font_01_sfnt_off00012d5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5E 16792 bytes
font_02_sfnt_off00014575.bin
d2769bb2c9b764a32fe22c621e02de479b24be958a0d7f2af31934b5e1607359
pdf-font-stream PDF embedded font (sfnt) at offset 0x14575 10852 bytes