Malicious PDF — malware analysis report

Static analysis result for SHA-256 805d7f675ea62736…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 17:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 575d60db56762e0712f75bcf6bee6210 SHA-1: 26c0dc824659a6a697c5c1790a7e9390511e2a2f SHA-256: 805d7f675ea62736dd695489c5b4617506bb5dfcd553142cd736688de9c97db4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm. The embedded JavaScript stream suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drproperty.in/userfiles/file/40411057459.pdf In PDF document text
    • http://interwork.sk/userfiles/file/javegivujosufalezosotunuk.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/48693041009.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/bavalilulu.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/92678523240.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/32053918281.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/48561128090.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/lotolugexusezoluwesej.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/23508841352.pdfIn PDF document text
    • http://synowka.pl/galeria/file/2236097509.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0be637d8---51963717557.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404d04d6d05---98562254233.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/pimusikapub.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/nijututimosogunadozifezo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161367f3b433ac---gagisedusupidizuvo.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/81464271660.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9aab2d60f853a727996b8184c1234e51/52857696111.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161322848d4c0a---83909515171.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/xomef.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/dazidagikojaturijetuz.pdfIn PDF document text
    • https://limsurempat.com/contents/files/duxovejovorepukijosubil.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/nulobelalonemamo.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/wisufazebogomajaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=harry+potter+and+the+order+of+the+phoenix+fullPDF 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_off0000d145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 10736 bytes
SHA-256: 379e2deb4a3f94ba9f5b7a6159797bb8d7fb41fc476e67b422cd85814403d9a0
font_02_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 17336 bytes
SHA-256: 28f85a4ec43a4cbebb6177c3c94eb8f13c9b1267648cbcd5ab7007bef0ee3b67

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