Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebd849c41ddfc59…

MALICIOUS

PDF

90.7 KB Created: 2021-08-08 23:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 77458f5b4addf10711d7502158d2b2e7 SHA-1: 43c83741ea3877d2c6bf3d489330b074a032da5a SHA-256: 3ebd849c41ddfc59f0477839512b457745cb73ddc37aa8d755a8f1f60157630b
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 0.9932

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://coretry.ru/uplcv?utm_term=how+do+you+write+a+handover+report+example PDF link annotation
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/t6sna3felug43h8unokhuld00f/kuvaxawomutakekojagezesex.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/22876456849.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/29889265850.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/mipojogijozokawawexe.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/dodunofuxoxev.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/06017e7c8a70b11a268f4296d2e14bdb/66424797700.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/xulumumekiz.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/88161250157.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cdbfaf570---89783274615.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/11672046076.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f19c0294a---sawunon.pdfIn PDF document text
    • http://ndt-ultratech.com/files/xozuwi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d26d7ba43f3---37676565829.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/87676706858.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/513c3585865cc9a535f909c13c8d7d9d/bakodowisujevijuvixis.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/benikozomujezepudawa.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/vawomez.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/vizisuluwub.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021080701433412.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/gunigekewugilovufexesote.pdfIn PDF document text
    • http://renknh.com/ckupload/files/xuvem.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c5b4f2e9---balivibasufevova.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/tcb6dpin9i0hmp5pb7bnef0ems/kebatexudalovuwidefa.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f584edea04---40379347856.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/pipurizakugugumumij.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/69847957163.pdfIn PDF document text
    • 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_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 17520 bytes
SHA-256: fa276b214b9d31fff81307833f3643a8bf6fd9d31c842fefa16d20ecf5be1184
font_01_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 10948 bytes
SHA-256: ab96701d23422e3362ff53a85dfbcab004d5577d66647870917eac74240c5662
font_02_sfnt_off000143c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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