Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe43747f715cacd…

MALICIOUS

PDF

81.2 KB Created: 2021-07-23 10:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee2da27c48c4a3ce0d5df3ed54832ad3 SHA-1: 5d2ae401bcd2752fc1f2f8722ffaa995e9e4aa3c SHA-256: 5fe43747f715cacd1119fb7f05e3ad67ba9e4813a56ec861dddf75e5d2b220a3
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a lure for phishing or malware distribution. The presence of a 'download button' heuristic further suggests an attempt to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/63v1nn52r3fsqkuvscnbm9qmai/61990675157.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/970e99f705ee04f1607f38d1fb8c3930/28951077829.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a462ae6e0---39627954191.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/dujido.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ssn548i07v4nah3gc0ukolhpjv/38527455419.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/uehmonqidoc0qbj67qcsbhepoa/xerosalajug.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/676420049eceb1f1c1c5519437f8bc5b/92927497418.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/19025325162.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/74926903405.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf886bd5c74---xivunejopifavupajodi.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/83635998793.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22939197564.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/p0j61l9e3db97lu3lqlcmq982n/66677478894.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/29638599121.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/53891519315.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/92856766038.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/zupegug.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/79055256010.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/dcd35a5743623e95f6ea75c56cb0f496/37822806642.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gijevemajo.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b4bfb86a868c83293180656486f2f98a/90850115464.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/eb6fa2180f68926154ad8517e442a37a/70801449087.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160968eef51220---sobixikoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=preposition+of+place+worksheets+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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 16800 bytes
SHA-256: 3521b2f80d30be29be798450177ccecbe46ab3c636ddcecb0c9d8a6a06dfaa81
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 10896 bytes
SHA-256: ff1c9a569ca5ce386cef256aff187c5512749f04eee21941b8fe07885603ecf6
font_02_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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