Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b04f59513fe1a42…

MALICIOUS

PDF

137.6 KB Created: 2021-09-04 14:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1815ed96309a6e8cf022458a4e24cc3 SHA-1: 14286f75b974ca9a7f695dc548e0fa81b648f854 SHA-256: 6b04f59513fe1a424726683a33cb0ff2833277baefa98432dd657c2754962f7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm hosted on compromised websites, likely to trick users into downloading a malicious payload. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16123636e486e2---1524227321.pdf In PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/89103595665.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/68813994936.pdfIn PDF document text
    • https://t2sc.me/userfiles/86763662525.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ad462c0cf87b4fbb495e6cc62f152eda/85460604583.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4eaa920ef6---33037972493.pdfIn PDF document text
    • https://norservis.com/files/files/resepom.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/wefuvuxufawimaso.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f3f3b3bf6---birelodobamufowijaf.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/jovegin.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/zaduxukanozasipupodiw.pdfIn PDF document text
    • https://edusfera.pl/upload/file/gulari.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/bcaed198e736cf3b03f181dc798eb794/53050441777.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/movudimafafiponumofan.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1fa9e2c80---60111656216.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/sujavabodedesas.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/50420340040.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gl03ekggtls99k4oqepckc2ri5/52056696918.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0628bcb040aceb2fe5d8e3e0800baaa4/31524696319.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/cghroc82g4he83a6ad0jqskvts/winuwuxoguzar.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/pulej.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/df1f600191e147231611930f38f8f729/tanixaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fourth+term+at+malory+towers+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_off0001b532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B532 19332 bytes
SHA-256: b8d396115f7db3e658ca8bab94971a86f2873474b190f5fb8ea3fb77b2bfb57c
font_01_sfnt_off0001e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF82 10844 bytes
SHA-256: a6a25c2a60e6bbf21607c0c73f5340799005ae2e3b40f452844445975d512a03

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