Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e43eaf7011b4c0…

MALICIOUS

PDF

71.7 KB Created: 2021-09-21 02:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64ce80adec8e9a17912b812311feaff2 SHA-1: 41187739f35fbc53db39042380d047663d5c84bc SHA-256: d3e43eaf7011b4c05edb37c17a9a1e9b08d9825bb62fda6d01b7fdd74be5fa12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to phishing or malware download sites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=verizon+droid+x+price PDF link annotation
    • http://gesundezellen.de/neu/userfiles/file/12380344723.pdfIn PDF document text
    • http://computerdoki.hu/user/file/44777435565.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/11089552712.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/wavurutuwenuwanine.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/0o00tjv2bpm1ps1r0p3pogu9n0/22423044117.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/62096379018.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/45556196319.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/64300464979.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/40713396266.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/94521246511.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/mujap.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/zenew.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/38002963583.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa9124cfe---67836284177.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/nawutorofujugusew.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/c7eju7u0kkv9s01topp522ljbh/fupazejawevegere.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/tubisamasujunurib.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/91004394080.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/timikejojakimo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613543cd043c7---4865272770.pdfIn PDF document text
    • https://ksboutlet.com/file/files/35951081811.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/pakajogubijemaxisizeruni.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/91708962400.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/96276243513.pdfIn PDF document text
    • 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_off0000b76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76A 10164 bytes
SHA-256: 740b48ad73736253d1c8e34c82686e76ab3b47090f703d7e194c5ee42a84fe57
font_01_sfnt_off0000ce42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 16584 bytes
SHA-256: 69f339fa25f7c1740798dd22fd9ec57c88b8e7334ac7ea7c7b9fda480239ecbd

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