Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6be10e743eddeb…

MALICIOUS

PDF

87.8 KB Created: 2021-09-21 05:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a38d535160a2c511319ee87bf91531a SHA-1: d81dc848fc7f9ea3b6ce2ec0680dbf5c03425157 SHA-256: 9b6be10e743eddebb9858fca4b07bf905c09bf81b831dce70335550747b70245
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The presence of multiple external URIs and a 'download button' lure suggests an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rafaelstore.ru/upload/files/rodifivivasovad.pdf In PDF document text
    • http://pneusmarene.it/images/file/batogokunu.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///ditamamu.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/lfl4ds0vjdnt3esu1c1ka8l6d4/lebanegu.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/voxusumi.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/25815517049.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/2989638503.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381ae167899---80811518614.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/12397478446.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/gademod.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43dc72e2---babokidaduwi.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/xiged.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/73430160487.pdfIn PDF document text
    • http://technocom.pl/editor/file/17514520857.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/85118616448.pdfIn PDF document text
    • http://th-hl.com///upload/files/89422524529.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/xewudekizozaxidipakis.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5a40f9c1---53822557271.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/65652280299.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/29487610561.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/95655711101.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/94868486691.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/20906328952.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/wofasivotamuxu.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/66735994088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=j2+stock+romPDF 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_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 18760 bytes
SHA-256: c2e1d33710de5aa4c0db8defd1e47ae08cf553bd284e10f035a2def58bb0582e
font_01_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 10056 bytes
SHA-256: 397aaf465dc4b7c3a813e2cfe05c9a38e906ae3a9b3d177a38d505f27c196124
font_02_sfnt_off000139db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1