Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e36dc7398ab18d…

MALICIOUS

PDF

93.6 KB Created: 2021-09-03 09:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 957bd9a555c1d3e97516c55d2bc5b48b SHA-1: 69365393dd884c2eced5041476df8973e57fdefb SHA-256: c6e36dc7398ab18d38b934e05ed52a90039f404ff4cb784c98eac5b493421ef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple links to compromised CMS uploads and disposable hosting reinforces the nature of this file as a distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1f29628ac---2530164049.pdf In PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/sepurixefipujeluruta.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/kaxavigekoxudijabomanul.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/vrkl34isjumfieotu857pbibf1/15297143682.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/pawupefoworaj.pdfIn PDF document text
    • https://securitydm.com/slicice/file/50228530837.pdfIn PDF document text
    • https://cubic.is/userfiles/file/40242353193.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/fijumixelugefipuzadozo.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/rugivemazex.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/wigibituxanonumajamafu.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/zebegin.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074fdacf2000---75147576404.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/kugogulukuxixoburorinu.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/pofovelajewa.pdfIn PDF document text
    • https://webmenuplus.com/images/file/manamigexep.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/popugilubozinitulezonuvo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7d963b389d8cea0af2a2ade77a4725fe/guliluwi.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/63239353035.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/tinukomej.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cd90f61dbc---26472750211.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bowikaxewebowowesuz.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/kores.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/82989648437.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/filezoxoputivegadiken.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/lusezotilekopid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=c+language+basic+interview+questions+with+answers+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_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 18220 bytes
SHA-256: 6762d9e039917ad5f0a6e32c11d6b8c044da3fbd9b6be81774e31b32e1ec06d8
font_01_sfnt_off00013586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9D 11468 bytes
SHA-256: a51f84313377e9fc4bdb68e3a9ee6f3dab4736f2ffa5987ec6b5c0d387b70742

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