Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5095524a98aab88…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 04:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 571f3efb4b2580631479b21d2e8498c6 SHA-1: 54fa611e46f4cbff9a2fc6d4730aa723a86635f4 SHA-256: f5095524a98aab885d7d6230249695fd63dd9c459f5305ac92972eff94222975
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gagiongvitgiong.com/ckfinder/userfiles/files/nifasasuk.pdf In PDF document text
    • http://drsuthichai.com/userfiles/files/zefixaxamudipalizobulev.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/pisejarala.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161317b7c6975b---josovurekeravike.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/80179943229.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cc37f977---talexetilixe.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/vujozuro.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/48764064609.pdfIn PDF document text
    • http://indexone.ru/upload/file/54984384548.pdfIn PDF document text
    • http://unibox.lv/files/text/kosadoxogedibi.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441948e2072---91122040427.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/18992966660.pdfIn PDF document text
    • https://value.ae/userfiles/file/xovegetekisow.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/46584805141.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/82593733330.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613282877060d---zubibas.pdfIn PDF document text
    • https://activepymes.com/pub/file/razebikivukobiruwidape.pdfIn PDF document text
    • http://markone-tools.com/upload/files/pirubogenewij.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/7508767929.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/zaligoxixodovasuto.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/17469212137.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/45081939968.pdfIn PDF document text
    • https://nevisnews.com/userfiles/20291120624.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/zapejuzot.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/61850505476.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/ledavuxigujaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=power+rangers+online+freePDF 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_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 10380 bytes
SHA-256: 2f0ce8395bff1ec72d423687499e47f0e527dd5982d9023c2d46d9a855f4252e
font_01_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 18560 bytes
SHA-256: 347b5fe9be04058125d03120bbfbeaa1c7096eeba4671eb0c3dbd092cb838d4f
font_02_sfnt_off00013167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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