Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64d390fc6e658d2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 13:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 644c21af5d2ad238ad2d4911fe245af5 SHA-1: d53cf70b75e2d0a18168283a0cab91fd5beafa69 SHA-256: c64d390fc6e658d2be7aeb211e9b2b3a92f7a870e88b8620b8cec59e9c694e16
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ClamAV and an ML classifier. It also functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of embedded JavaScript indicates a potential for executing malicious code within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cd19e5f86---zobipavofezirix.pdf In PDF document text
    • http://zit-tech.com/userfiles/files/fowapigagixawesikanod.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/71310918050.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613909e763c13---dosukosup.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/35802110479.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/jalitazatagiterug.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/53575173872.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/95953469546.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/14823372515.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/ragulele.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/gututufapisofabufavup.pdfIn PDF document text
    • https://apra.pl/files/file/zutulolavutufuja.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/tugofodiluvu.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/dikawako.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/11505060647.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613692c533e91---70749172741.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/72103970290.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/96310212690.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613238f6b5aad---pikekosol.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rcpqc6ljiohjng7pfuk47e3tmq/mivotosatizipakurul.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/rifas.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c9432834---tibotifimufabawuzexik.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161458e7f85380---18885236494.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/62448912019.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/2833985178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=movie+rockers+tamil+2021PDF 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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 10732 bytes
SHA-256: 807477ad8380231db081f5fac86fdb307542aec53b745031261998612d2513b2
font_01_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 18116 bytes
SHA-256: 4a92425694e9502bce9f5e5e78fb09c50fce12afd74ade4b422ada54aa06d2d0
font_02_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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