Malicious PDF — malware analysis report

Static analysis result for SHA-256 c822fc4610fe6a04…

MALICIOUS

PDF

86.4 KB Created: 2021-07-17 21:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c27e2b3efb8b48fc709fd3538c7a0abc SHA-1: 479c9b3ec08676800178b0306657f1d59b4ab8b2 SHA-256: c822fc4610fe6a0410a50cb4db4f2d17d03c2379faa1a1a7dfad9e2ed40598ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or facilitate phishing. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tidurmalam.com/contents//files/timanusolalobemebu.pdf In PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2d6f3d478fe52e68251f15a4a3cddc93/35229215395.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160895dc1cc6cf---12341111701.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40e306ab7---gatuxuponefexewuli.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/40475414181.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7a4fa24ad---19595271831.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160872601d126b---31297275875.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/lipotis.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b0f518a96---lomavomakomiw.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1n7q3jm4evijstu03dpt4vs1u6/bebiwixumunaxafasurupen.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/bamipew.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/tewevep.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/94861842166.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/muxaziwuvovuko.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/26729469170.pdfIn PDF document text
    • https://tomas-music.com/contents//files/pumuxadidofakavuri.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/t76dqrk77327oh1r87e892bhm5/83621377678.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/fotoludafiwemanopapugixag.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/zelusomu.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/jarezefiti.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/24610106477.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a148a75c2a---20323948336.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/69478462984.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9736f768f1---fedixuvof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=stephen+campbell+barristerPDF 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_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 17244 bytes
SHA-256: fb9860c93023eb0736118445cfcfa224c382062d884ed7ac279fb9f0640139ff
font_02_sfnt_off00013408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13408 10736 bytes
SHA-256: b435ea0a0be9f74a53d0d3bc2e737eb6e1f29a9778ed7b6e753de455f38516f0

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