Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3a69f60ab27cbf…

MALICIOUS

PDF

72.5 KB Created: 2021-10-10 08:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d8c44f09f13a4fc7f2ced0218cbb9fac SHA-1: 2ab2f3c3d8bae7e261a1ab2038728ea2db424447 SHA-256: 2a3a69f60ab27cbff4b950db0721daa52748027af6de4518f698a311138dbc40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting an attempt to obscure the true destination of the malicious links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/03a8fa3e8cc03281203fc81b498b8237/fiwuve.pdf In PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210921_125607_186.pdfIn PDF document text
    • http://net-marketing.hu/images/files/57957625796.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210920031750.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6a655ecbe77b5aeac6d28ccde416dde0/pikuxezozobade.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/54705486944.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/vugogekarodum.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/67339524422.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/rumiretorufupeniji.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/tivibutavujatininopadibad.pdfIn PDF document text
    • http://xdankfort.com/rhnew/file/sikugepez.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615aa34a21c47---debusozevisul.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/dowiponizegeduvutoxek.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/75910371176.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/jinetilujujalid.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/62905505020.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/92656915959.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/7698771206145d690c6996.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/51080212453.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/66087418499.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/tupovezineliboseraz.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/wetemodazuxolodesofoku.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/13359771186.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/58089760325.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/8437741668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=7+pounds+12+ounces+in+kgPDF 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_off0000ba71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA71 16384 bytes
SHA-256: 1d9d4c30a56445cc20869bc7995f2986f17ffd4307215e17d03371141811908d
font_01_sfnt_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 10600 bytes
SHA-256: ad4bd579cbba5fb271e5ba4d345685e9a8e687d423835a4959a2aa5fcfb549e9
font_02_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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