Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b023ef8faa1065…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 02:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fec17919033744ab96d544aa63211bd6 SHA-1: 3c8818474ca0c7b686772c9123668bc12cb13870 SHA-256: 24b023ef8faa1065e1e7c2ff8439b7c5b31864ed573063ddfdab237bbec93167
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading users to phishing or malware download sites, and contains language suggestive of an invoice or payment lure. The presence of numerous URLs pointing to compromised CMS uploads and disposable hosting further supports its role as a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://alrabbancapital.com/file/files/20111573536.pdf In PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e27e2511d07c7e1899866cebf86b1680/bakepaxidonumodotas.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096a81b4f40a---55367074549.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f315398a---93362280266.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/48054160209.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/dejekixojorodarose.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/38069213298.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1619867f0e---laboralomezumin.pdfIn PDF document text
    • http://heureka-cz.eu/files/11721039130.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/namokupip.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/73581934515.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/gikelijilamubigazev.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/40768408702.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/vemurebimilepidalofobelit.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93138eddc---65116185013.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58d880030---zewog.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/fuwilir.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/85777824500.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/6a44fa950a77f0a375b48ce2a3265477/66896189367.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3319b44d048eb54961c681593fd4ba18/lixar.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/woxifekebirukufojagafija.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/11ce8253f2f6f7b411b1d9ddb5f9edf6/61560002257.pdfIn PDF document text
    • http://one9five.com/userfiles/files/rakulilisebomesimarasa.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/minusamepu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c731dc8e2b---86626276296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=aida+model+of+advertising+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_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 18200 bytes
SHA-256: e8639c4c256389379859c1cf315d01b21eaea36b53601cff31d1e38765f98abd
font_02_sfnt_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 10888 bytes
SHA-256: a93d809ba691c4c6e19485babcd39bc13a8fe24061645a6dd7d80cf040b90dec

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