Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd59c0de2c499903…

MALICIOUS

PDF

93.3 KB Created: 2021-07-21 17:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e6c920040c4e4ecf93ccd6f7bebdab58 SHA-1: 3642fdee882749f537fc7348d3a43dc07c876514 SHA-256: fd59c0de2c4999034afce1366f2a5cd5ac7b679e77f6ae2215b774ae13b6e60a
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to PDFs hosted on compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple unknown PDF files suggests a distribution mechanism for further malware or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081693d32978---98215980478.pdf In PDF document text
    • http://stomerijindex.nl/images/uploads/xojijafo.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/biguj.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/34782125951.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/kivowiboleja.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/87104930583.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/97361574048.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/41145056215.pdfIn PDF document text
    • http://nfc.soo.jp/file/gojodomukakukorajufeja.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/82394710258.pdfIn PDF document text
    • http://uco-kampen.com/media/files/wimowixawefovosas.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d3b87f2fc---dejejikaw.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39326d23f---21423953718.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1f6lq5b7s9rbt17v8tnraubq4s/petamakukas.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/7986583894.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/pivuwibe.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b216bf1908---bovijakepibukutisizaradub.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/vemupepajorupenorojawuda.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/garudam.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/db66a404c533b885b0012a76ed3015f0/rezewapof.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098f0aba147f---gajiwodiwagipakisekaresut.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c8b285b9381acfa2bc735d9190972b4b/wasabijakewama.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b5a76d096---76126824101.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/jibatodaluxamegupugepi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/959b2075f7b4cae5734f018a774ea6cb/87509514200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=general+knowledge+questions+for+class+3PDF 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_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 16744 bytes
SHA-256: e99e63f7b3d8bcf77ea447dbb94a3d9045d0afd610673d83549193f71ef51daa
font_01_sfnt_off00013471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13471 11284 bytes
SHA-256: 66b9ef234de7f916d06619f83bd1761e121c95c2e0f1f48c4ab03cc5a9f0854c
font_02_sfnt_off00014eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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