Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcd6f8dbd0e8e3b…

MALICIOUS

PDF

89.1 KB Created: 2021-07-31 05:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4ac689a7118503431cdb64fc0ae040ea SHA-1: 3f327f85a8d53dd0e63bdadbbcc119ccd3613819 SHA-256: 5fcd6f8dbd0e8e3bf359518a9ada1086bd491d8a40694c83b1d654591f8ec112
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 0.9992

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/i6kcqok5rm13fjgct987n9s4et/novabixulagakogikibofinuk.pdf In PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/db052e810d96396e0a8adb15aba646d7/jinudisabirexixerosisetoz.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe4a22d5d---65689788429.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/60903013526.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce90813a82---wupova.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/dujoxarowopubev.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/88518148386.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/gososuluwemomopemamanune.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b20e6e0d4de---xasizowegonadiduwusu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becf8d06744---25782098364.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7995c92a8b---34950296257.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/wiluzubofifubixoxo.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vsiki4ajbaf4r3gf4lkc2gn9lv/63942381259.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/40560602895.pdfIn PDF document text
    • http://flexicourse.cz/res/file/juxesosafigosoluzibenu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ad256dbc2---pulomutomebimajunezode.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/86702899865.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160920634b88ce---kobatoli.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/mokakusenanavomomebokamir.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/vijokuriwik.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98ba2a6a2---wuwirevugikaruv.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/74329003760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cars+3+full+movie+in+hindi+download+tamilrockersPDF 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_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 17436 bytes
SHA-256: 1e66081d2a5d5b4e670af192bfaa131938fe124bbd1097840b215858f6432dcb
font_02_sfnt_off00013b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B62 11288 bytes
SHA-256: 85ed3bc99209817037c1e1d645f3878c5b5019ac24bb8a6665b53c2eb07231b0

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