Malicious PDF — malware analysis report

Static analysis result for SHA-256 647fe5946ff0fb8d…

MALICIOUS

PDF

83.5 KB Created: 2021-07-21 17:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 549f586cead5b8f843952d72505cf57f SHA-1: a6930f04eb87b036b99c1a3f8bbc253ca7825488 SHA-256: 647fe5946ff0fb8d62c098626c2bb23eec91ea9820379e9ed0abdf8a4f2957ae
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 0.9981

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 https://dallaslandscapedesign.com/media/files/lusamepeza.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606c882e54209---wigufifemetanimifemaso.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/573jfi6lk6rlmv0iko1k6f4007/wanolit.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/jixosemonewakanofi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b48869371bb---67635951869.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed9ab5f704---tilejovuvelepinaxolabav.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3c7f8fe355f494a7de3ba58d6ef3cc38/zijukikodeba.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/gukikoririkori.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca92de3a92---3710193318.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/80290999621.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/66207853f7bf22087598d3ffc5d2987f/34472097730.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/020159258376.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/19514964795.pdfIn PDF document text
    • https://red-adlay.com/upload/files/jirezepudidefekuzovijaror.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/99020494455.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/kumumibowuvomubefidit.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/47033637054.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608045f391e64---nuzekipezutanisizoga.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210630_911F479FDFE37A2C.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/56d724c512b73c215d5fc2c4245ad2f7/banegemew.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/nck52trgqf51f76aed2q01thcr/24507604621.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/nowex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=wwe2k17+apk+download+for+androidPDF 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_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 10620 bytes
SHA-256: 1148cf41b5949fa0ccb235a708292f6c432000daa8ebb3fa37fa3e1d1222085e
font_02_sfnt_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 16308 bytes
SHA-256: f58f5ee0fc7aee6f7efebb07fbaae1a0c85eda8071a6010e20b45594cd73bd7a