Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ff0d16d1d0d64d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 10:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0aa666ac60be81a4fae9b681dcb6710 SHA-1: 98ff2cad2bf2fc09ef45120b64af712d111c6554 SHA-256: b7ff0d16d1d0d64de6bc1cfec9139e2b057b714590b2740b6c933773c0d2f1b9
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised websites or disposable hosting, characteristic of a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to direct users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://fashioneducation.ru/userfiles/file/dawewunutuw.pdf In PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/bamurizazogusuvu.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/lusoxota.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cedc1a0fc67---78352451710.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/jarebineratizikupure.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a59f9c809---xazudivik.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/govubawerunap.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50221933033.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/dilarazibefoj.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/wekibofaberonaset.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125f867cfe27---zupazukuvedob.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb56bea02---85238673585.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/begitufa.pdfIn PDF document text
    • http://jar-ted.pl/file/77627132731.pdfIn PDF document text
    • https://123natura.com/stockages/files/78471080948.pdfIn PDF document text
    • http://beiks.info/public/file/3213272696.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/dujamupin.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/37e5a98d5176285ab1f93e47a6bf009b/41101770917.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/33183795451.pdfIn PDF document text
    • http://accronline.com/userfiles/file/30421847549.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/65670138196.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/81830240267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=best+way+to+get+stubs+in+mlb+the+show+21PDF 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_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 11120 bytes
SHA-256: 161ca0ec5ffa5278419d734c680911e699913f82629ab45c8a570e8e2029e943
font_01_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 17756 bytes
SHA-256: fc2dc5c33ab9b029864b210de7e1b332a5f25cf60ee86e3f866d990a007b4aac
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1