Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c39c4012cf96266…

MALICIOUS

PDF

84.2 KB Created: 2021-06-29 04:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 97fbdb38697cacdadddddeb046b15807 SHA-1: 1ee48ec8958e9761094623d86948977cd9bf1df6 SHA-256: 4c39c4012cf9626602e2db868c1ee86893b75e52251e1f16129f3d06bee5ddb1
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160adb1578617e---zubag.pdf In PDF document text
    • http://capri.lt/userfiles/files/vamalavininavuzoj.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/40766268256.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/keziduroxiwoxite.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/tejumuta.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68bff40f6---58215538968.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jovumigededoviwoto.pdfIn PDF document text
    • http://cocoal.com/uploads/file/67455706155.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/35752485979.pdfIn PDF document text
    • https://schmitz.cz/res/file/51449581723.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16091e0349efba---somaja.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/taduzuxoxazifitufemu.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/8306b57f4a3bbd386e5baa86d4d00f3f/bibifujereluso.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/3donon8snm7v982t0p92hkm06b/54371700056.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/97207208179.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609270f47f69a---91847523002.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/sulujomujuvobijux.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/regujebab.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084372730e26---vogiri.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f660fc24dd---94038984502.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/17398122630.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/xavowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rs+aggarwal+class+12+pdf+free+download+full+bookPDF 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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 11240 bytes
SHA-256: d41274f61044793afbe6da7c2665efa99e4ca5d9ebea215daf5d49cb0f91ca2f
font_01_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 17444 bytes
SHA-256: 7913ae01e7de96d3443223f7986818a6388142108c1cd20aa6b4d544d670e307